Inverse Square Law, Blackbody Radiation

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Inverse Square Law, Blackbody Radiation"

Transcription

1 Inverse Square aw, lackbody Radiation The Inverse Square aw for Radiation The amount of energy emitted in one second by a source of light is called its luminosity and is measured in watts. A source of light with a luminosity of 1 watt emits one joule of energy per second. The luminosity of the Sun is 3.8 watts. As light travels away from a spherical source, its energy spreads out over the surfaces of spheres of increasing radius as shown in the figure. How bright the light appears to a detector (such as the eye or a photometer) depends on how fast the radiant energy enters the detector through the aperture (the pupil in the case of an eye). This depends on the flux (energy crossing a unit of area in a unit of time). Energy lux Area Time 1 r r1 uminosity Area A The flux due to a spherical source is inversely proportional to the square of the distance from the source. Area of a sphere πr r r 1 1

2 lackbody Radiation lackbody something that absorbs all electromagnetic radiation incident on it. A blackbody does not necessarily look black. Its color depends on its temperature. The Sun and other stars behave approximately like blackbodies. The amount of electromagnetic radiation, with a given wavelength, emitted by a square meter of a blackbody s surface in one second is given by the Planck blackbody radiation law. It is displayed as a graph on the following slide. The temperature of an object is a measure of its random kinetic energy. The temperature scale used by physicists and astronomers is the absolute Kelvin scale. The temperature at which a body can emit no energy is absolute zero. One Kelvin 1 Celsius degree 1.8 ahrenheit degree. The freezing point of water is about 73 K 3 o. Comparison of the Solar (T 5800 K) Continuous Spectrum with that of a 3500 K Star meter flux in watts per square m wavelength in nanometers The 3500 K star is brightest at a wavelength around 88 nm. This is infrared radiation, so we don t see it. Since the visible part of this star s spectrum is strongest at red and orange wavelengths, it has a faint red - orange color.

3 Planck s aw for lackbody Radiation square meter flux in watts per or a star with T 7500 K or a star with T 5800 K wavelength in nanometers The visible spectrum (about 00 to 700 nm) is superimposed on the graph). The peak of the graph for the star with a surface temperature of 7500 K is at a wavelength of 38 nm (violet). In the visible light from this star, there would be a bit more blue and violet than the other colors. The star would have a faint blue color. Our Sun has a surface temperature of 5800 K. The wavelength at which it is brightest is 500 nm (green). It has a faint yellow color. Wien s aw and the Stefan-oltzman aw Notice that (a) the higher the temperature, the shorter the wavelength at which the star is brightest and (b) the higher the temperature the greater the area under the graph. (a) is Wien s law. Stated more precisely, it says that the wavelength λ max at which the blackbody is brightest is inversely proportional to its absolute temperature T. If T is in Kelvins and λ is in nm, then 7000 K 5800 K 3500 K λ.898 T (b) is the Stefan-oltzman aw: The flux from the blackbody s surface () is directly proportional to the fourth power of its temperature. If is in watts per square meter and T is in Kelvins, σ σ W 8 T mk T A A T. 3

4 Example : The surface temperature of the Sun is about 5800 K, and the surface temperature of Sirius is about 11,000 K. Compare the surface flux (the electromagnetic energy emitted by 1 m of surface in 1 second) of the star Sirius with the surface flux of the Sun. A Sirius and Sun T A 11,000 K T 5800 K A A ( 1.897) A 1.9 Sirius is about 13 times brighter than the Sun. Example 3: At what wavelength does Sirius emit the most electromagnetic energy? λ. T 11,000 K λ. T 100 λ 3 nm This is a bit shorter than violet, so Sirius is brightest at ultraviolet wavelengths. The visible wavelengths at which it is brightest are violet and blue, so Sirius has a pale blue color. Estimating the Temperature of a Planet rate of absorption of solar energy by the planet rate of emission of blackbody radiation by the planet Solar luminosity Sunlight a albedo fraction of incident light that is reflected. 1 a fraction that is absorbed π R cross section of the planet illuminated by the Sun. πd flux of solar energy at distance d from the Sun.

5 π R πd solar energy hitting the planet's surface in a unit of time 1 a π R solar energy absorbed by the planet in a unit of time πd ( ) σ T energy emitted by a unit of the planet's surface in a unit of time. π R surface area of the planet. πr σ T energy emitted by the planet's in a unit of time. ( ) π σ π R T 1 a R d π T 1 a π d σ ( ) ( ) T 1 a 1 σπ d T ( 1 a) 1 d σπ 1/ 1/ 1/ 1 a 1 σπ d 1 a T 79K d AU 1/ d AU distance from the Sun in AU. Example : Earth s average albedo is approximately 0.3. Calculate its average temperature in (a) Kelvin, (b) Celsius, and (c) ahrenheit. 1/ T 79K 33K 1 ( 33 73) C 0 C ( ) Example 5: Repeat Example for Venus (a 0.7, d AU 0.73). Example : Repeat Example for Mercury (a 0.1, d AU 0.387). 5

The Nature of Electromagnetic Radiation

The Nature of Electromagnetic Radiation II The Nature of Electromagnetic Radiation The Sun s energy has traveled across space as electromagnetic radiation, and that is the form in which it arrives on Earth. It is this radiation that determines

More information

Astronomy 114 Summary of Important Concepts #1 1

Astronomy 114 Summary of Important Concepts #1 1 Astronomy 114 Summary of Important Concepts #1 1 1 Kepler s Third Law Kepler discovered that the size of a planet s orbit (the semi-major axis of the ellipse) is simply related to sidereal period of the

More information

Take away concepts. What is Energy? Solar Energy. EM Radiation. Properties of waves. Solar Radiation Emission and Absorption

Take away concepts. What is Energy? Solar Energy. EM Radiation. Properties of waves. Solar Radiation Emission and Absorption Take away concepts Solar Radiation Emission and Absorption 1. 2. 3. 4. 5. 6. Conservation of energy. Black body radiation principle Emission wavelength and temperature (Wein s Law). Radiation vs. distance

More information

TOPIC 5 (cont.) RADIATION LAWS - Part 2

TOPIC 5 (cont.) RADIATION LAWS - Part 2 TOPIC 5 (cont.) RADIATION LAWS - Part 2 Quick review ELECTROMAGNETIC SPECTRUM Our focus in this class is on: UV VIS lr = micrometers (aka microns) = nanometers (also commonly used) Q1. The first thing

More information

Physics Open House. Faraday's Law and EM Waves Change in the magnetic field strength in coils generates a current. Electromagnetic Radiation

Physics Open House. Faraday's Law and EM Waves Change in the magnetic field strength in coils generates a current. Electromagnetic Radiation Electromagnetic Radiation (How we get most of our information about the cosmos) Examples of electromagnetic radiation: Light Infrared Ultraviolet Microwaves AM radio FM radio TV signals Cell phone signals

More information

5. The Nature of Light. Does Light Travel Infinitely Fast? EMR Travels At Finite Speed. EMR: Electric & Magnetic Waves

5. The Nature of Light. Does Light Travel Infinitely Fast? EMR Travels At Finite Speed. EMR: Electric & Magnetic Waves 5. The Nature of Light Light travels in vacuum at 3.0. 10 8 m/s Light is one form of electromagnetic radiation Continuous radiation: Based on temperature Wien s Law & the Stefan-Boltzmann Law Light has

More information

Teaching Time: One-to-two 50-minute periods

Teaching Time: One-to-two 50-minute periods Lesson Summary Students create a planet using a computer game and change features of the planet to increase or decrease the planet s temperature. Students will explore some of the same principles scientists

More information

Lecture 8: Radiation Spectrum. Radiation. Electromagnetic Radiation

Lecture 8: Radiation Spectrum. Radiation. Electromagnetic Radiation Lecture 8: Radiation Spectrum The information contained in the light we receive is unaffected by distance The information remains intact so long as the light doesn t run into something along the way Since

More information

The Cosmic Perspective Seventh Edition. Light and Matter: Reading Messages from the Cosmos. Chapter 5 Reading Quiz Clickers

The Cosmic Perspective Seventh Edition. Light and Matter: Reading Messages from the Cosmos. Chapter 5 Reading Quiz Clickers Reading Quiz Clickers The Cosmic Perspective Seventh Edition Light and Matter: Reading Messages from the Cosmos 5.1 Light in Everyday Life How do we experience light? How do light and matter interact?

More information

Chapter 2: Solar Radiation and Seasons

Chapter 2: Solar Radiation and Seasons Chapter 2: Solar Radiation and Seasons Spectrum of Radiation Intensity and Peak Wavelength of Radiation Solar (shortwave) Radiation Terrestrial (longwave) Radiations How to Change Air Temperature? Add

More information

How Matter Emits Light: 1. the Blackbody Radiation

How Matter Emits Light: 1. the Blackbody Radiation How Matter Emits Light: 1. the Blackbody Radiation Announcements n Quiz # 3 will take place on Thursday, October 20 th ; more infos in the link `quizzes of the website: Please, remember to bring a pencil.

More information

From lowest energy to highest energy, which of the following correctly orders the different categories of electromagnetic radiation?

From lowest energy to highest energy, which of the following correctly orders the different categories of electromagnetic radiation? From lowest energy to highest energy, which of the following correctly orders the different categories of electromagnetic radiation? From lowest energy to highest energy, which of the following correctly

More information

Principle of Thermal Imaging

Principle of Thermal Imaging Section 8 All materials, which are above 0 degrees Kelvin (-273 degrees C), emit infrared energy. The infrared energy emitted from the measured object is converted into an electrical signal by the imaging

More information

Some Basic Principles from Astronomy

Some Basic Principles from Astronomy Some Basic Principles from Astronomy The Big Question One of the most difficult things in every physics class you will ever take is putting what you are learning in context what is this good for? how do

More information

Radiation Transfer in Environmental Science

Radiation Transfer in Environmental Science Radiation Transfer in Environmental Science with emphasis on aquatic and vegetation canopy media Autumn 2008 Prof. Emmanuel Boss, Dr. Eyal Rotenberg Introduction Radiation in Environmental sciences Most

More information

Blackbody radiation. Main Laws. Brightness temperature. 1. Concepts of a blackbody and thermodynamical equilibrium.

Blackbody radiation. Main Laws. Brightness temperature. 1. Concepts of a blackbody and thermodynamical equilibrium. Lecture 4 lackbody radiation. Main Laws. rightness temperature. Objectives: 1. Concepts of a blackbody, thermodynamical equilibrium, and local thermodynamical equilibrium.. Main laws: lackbody emission:

More information

Investigating electromagnetic radiation

Investigating electromagnetic radiation Investigating electromagnetic radiation Announcements: First midterm is 7:30pm on 2/17/09 Problem solving sessions M3-5 and T3-4,5-6. Homework due at 12:50pm on Wednesday. We are covering Chapter 4 this

More information

1. Radiative Transfer. 2. Spectrum of Radiation. 3. Definitions

1. Radiative Transfer. 2. Spectrum of Radiation. 3. Definitions 1. Radiative Transfer Virtually all the exchanges of energy between the earth-atmosphere system and the rest of the universe take place by radiative transfer. The earth and its atmosphere are constantly

More information

PTYS/ASTR 206 Section 2 Spring 2007 Homework #2 (Page 1/5) NAME: KEY

PTYS/ASTR 206 Section 2 Spring 2007 Homework #2 (Page 1/5) NAME: KEY PTYS/ASTR 206 Section 2 Spring 2007 Homework #2 (Page 1/5) NAME: KEY Due Date: start of class 2/6/2007 5 pts extra credit if turned in before 9:00AM (early!) (To get the extra credit, the assignment must

More information

Solar Flux and Flux Density. Lecture 3: Global Energy Cycle. Solar Energy Incident On the Earth. Solar Flux Density Reaching Earth

Solar Flux and Flux Density. Lecture 3: Global Energy Cycle. Solar Energy Incident On the Earth. Solar Flux Density Reaching Earth Lecture 3: Global Energy Cycle Solar Flux and Flux Density Planetary energy balance Greenhouse Effect Vertical energy balance Latitudinal energy balance Seasonal and diurnal cycles Solar Luminosity (L)

More information

Newton s laws of motion and gravity

Newton s laws of motion and gravity Newton s laws of motion and gravity 1. Every body continues in a state of rest or uniform motion (constant velocity) in a straight line unless acted on by a force. (A deeper statement of this law is that

More information

Lecture 7: Light Waves. Newton s Laws of Motion (1666) Newton s First Law of Motion

Lecture 7: Light Waves. Newton s Laws of Motion (1666) Newton s First Law of Motion Lecture 7: Light Waves Isaac Newton (1643-1727) was born in the year Galileo died He discovered the Law of Gravitation in 1665 He developed the Laws of Mechanics that govern all motions In order to solve

More information

Light and Spectra. COLOR λ, nm COLOR λ, nm violet 405 yellow 579 blue 436 orange 623 green 492 red 689

Light and Spectra. COLOR λ, nm COLOR λ, nm violet 405 yellow 579 blue 436 orange 623 green 492 red 689 Light and Spectra INTRODUCTION Light and color have intrigued humans since antiquity. In this experiment, you will consider several aspects of light including: a. The visible spectrum of colors (red to

More information

Solar Energy. Outline. Solar radiation. What is light?-- Electromagnetic Radiation. Light - Electromagnetic wave spectrum. Electromagnetic Radiation

Solar Energy. Outline. Solar radiation. What is light?-- Electromagnetic Radiation. Light - Electromagnetic wave spectrum. Electromagnetic Radiation Outline MAE 493R/593V- Renewable Energy Devices Solar Energy Electromagnetic wave Solar spectrum Solar global radiation Solar thermal energy Solar thermal collectors Solar thermal power plants Photovoltaics

More information

Homework #4 Solutions ASTR100: Introduction to Astronomy Fall 2009: Dr. Stacy McGaugh

Homework #4 Solutions ASTR100: Introduction to Astronomy Fall 2009: Dr. Stacy McGaugh Homework #4 Solutions ASTR100: Introduction to Astronomy Fall 2009: Dr. Stacy McGaugh Chapter 5: #50 Hotter Sun: Suppose the surface temperature of the Sun were about 12,000K, rather than 6000K. a. How

More information

Light, Light Bulbs and the Electromagnetic Spectrum

Light, Light Bulbs and the Electromagnetic Spectrum Light, Light Bulbs and the Electromagnetic Spectrum Spectrum The different wavelengths of electromagnetic waves present in visible light correspond to what we see as different colours. Electromagnetic

More information

Photosynthesis and Light in the Ocean Adapted from The Fluid Earth / Living Ocean Heather Spalding, UH GK-12 program

Photosynthesis and Light in the Ocean Adapted from The Fluid Earth / Living Ocean Heather Spalding, UH GK-12 program Photosynthesis and Light in the Ocean Adapted from The Fluid Earth / Living Ocean Heather Spalding, UH GK-12 program Algae, like your Halimeda, and plants live in very different environments, but they

More information

The Electromagnetic Spectrum

The Electromagnetic Spectrum The Electromagnetic Spectrum 1 Look around you. What do you see? You might say "people, desks, and papers." What you really see is light bouncing off people, desks, and papers. You can only see objects

More information

STAAR Science Tutorial 30 TEK 8.8C: Electromagnetic Waves

STAAR Science Tutorial 30 TEK 8.8C: Electromagnetic Waves Name: Teacher: Pd. Date: STAAR Science Tutorial 30 TEK 8.8C: Electromagnetic Waves TEK 8.8C: Explore how different wavelengths of the electromagnetic spectrum such as light and radio waves are used to

More information

Energy Pathways in Earth s Atmosphere

Energy Pathways in Earth s Atmosphere BRSP - 10 Page 1 Solar radiation reaching Earth s atmosphere includes a wide spectrum of wavelengths. In addition to visible light there is radiation of higher energy and shorter wavelength called ultraviolet

More information

Name: Class: Date: ID: A

Name: Class: Date: ID: A Name: Class: _ Date: _ Practice Quiz 4 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. What is the wavelength of the longest wavelength light that can

More information

Overview. What is EMR? Electromagnetic Radiation (EMR) LA502 Special Studies Remote Sensing

Overview. What is EMR? Electromagnetic Radiation (EMR) LA502 Special Studies Remote Sensing LA502 Special Studies Remote Sensing Electromagnetic Radiation (EMR) Dr. Ragab Khalil Department of Landscape Architecture Faculty of Environmental Design King AbdulAziz University Room 103 Overview What

More information

a) species of plants that require a relatively cool, moist environment tend to grow on poleward-facing slopes.

a) species of plants that require a relatively cool, moist environment tend to grow on poleward-facing slopes. J.D. McAlpine ATMS 611 HMWK #8 a) species of plants that require a relatively cool, moist environment tend to grow on poleward-facing slopes. These sides of the slopes will tend to have less average solar

More information

The Electromagnetic Spectrum

The Electromagnetic Spectrum INTRODUCTION The Electromagnetic Spectrum I. What is electromagnetic radiation and the electromagnetic spectrum? What do light, X-rays, heat radiation, microwaves, radio waves, and gamma radiation have

More information

ESCI 107/109 The Atmosphere Lesson 2 Solar and Terrestrial Radiation

ESCI 107/109 The Atmosphere Lesson 2 Solar and Terrestrial Radiation ESCI 107/109 The Atmosphere Lesson 2 Solar and Terrestrial Radiation Reading: Meteorology Today, Chapters 2 and 3 EARTH-SUN GEOMETRY The Earth has an elliptical orbit around the sun The average Earth-Sun

More information

Tech Bulletin. Understanding Solar Performance

Tech Bulletin. Understanding Solar Performance Tech Bulletin Understanding Solar Performance Bekaert solar control window films use advanced technology to benefit consumers with quality solutions that enhance comfort and decrease energy use. By understanding

More information

Light. Light. Overview. In-class activity. What are waves? In this section: PSC 203. What is it? Your thoughts?

Light. Light. Overview. In-class activity. What are waves? In this section: PSC 203. What is it? Your thoughts? Light PSC 203 Overview In this section: What is light? What is the EM Spectrum? How is light created? What can we learn from light? In-class activity Discuss your answers in groups of 2 Think of as many

More information

MAKING SENSE OF ENERGY Electromagnetic Waves

MAKING SENSE OF ENERGY Electromagnetic Waves Adapted from State of Delaware TOE Unit MAKING SENSE OF ENERGY Electromagnetic Waves GOALS: In this Part of the unit you will Learn about electromagnetic waves, how they are grouped, and how each group

More information

Light as a Wave. The Nature of Light. EM Radiation Spectrum. EM Radiation Spectrum. Electromagnetic Radiation

Light as a Wave. The Nature of Light. EM Radiation Spectrum. EM Radiation Spectrum. Electromagnetic Radiation The Nature of Light Light and other forms of radiation carry information to us from distance astronomical objects Visible light is a subset of a huge spectrum of electromagnetic radiation Maxwell pioneered

More information

Full window version (looks a little nicer). Click <Back> button to get back to small framed version with content indexes.

Full window version (looks a little nicer). Click <Back> button to get back to small framed version with content indexes. Production of Light Full window version (looks a little nicer). Click button to get back to small framed version with content indexes. This material (and images) is copyrighted!. See my copyright

More information

Astronomy 110 Homework #04 Assigned: 02/06/2007 Due: 02/13/2007. Name:

Astronomy 110 Homework #04 Assigned: 02/06/2007 Due: 02/13/2007. Name: Astronomy 110 Homework #04 Assigned: 02/06/2007 Due: 02/13/2007 Name: Directions: Listed below are twenty (20) multiple-choice questions based on the material covered by the lectures this past week. Choose

More information

Name Class Date. spectrum. White is not a color, but is a combination of all colors. Black is not a color; it is the absence of all light.

Name Class Date. spectrum. White is not a color, but is a combination of all colors. Black is not a color; it is the absence of all light. Exercises 28.1 The Spectrum (pages 555 556) 1. Isaac Newton was the first person to do a systematic study of color. 2. Circle the letter of each statement that is true about Newton s study of color. a.

More information

Light. What is light?

Light. What is light? Light What is light? 1. How does light behave? 2. What produces light? 3. What type of light is emitted? 4. What information do you get from that light? Methods in Astronomy Photometry Measure total amount

More information

Phys 2310 Wed. Sept. 21, 2016 Today s Topics

Phys 2310 Wed. Sept. 21, 2016 Today s Topics Phys 2310 Wed. Sept. 21, 2016 Today s Topics - Brief History of Light & Optics Electromagnetic Spectrum Electromagnetic Spectrum Visible, infrared & ultraviolet Wave/Particle Duality (waves vs. photons)

More information

What is Solar Control?

What is Solar Control? A better environment inside and out. Solar, Safety and Security Window Films: Tech Bulletin Understanding Solar Performance Solar Gard solar control window films use advanced technology to benefit consumers

More information

Blackbody Radiation References INTRODUCTION

Blackbody Radiation References INTRODUCTION Blackbody Radiation References 1) R.A. Serway, R.J. Beichner: Physics for Scientists and Engineers with Modern Physics, 5 th Edition, Vol. 2, Ch.40, Saunders College Publishing (A Division of Harcourt

More information

After a wave passes through a medium, how does the position of that medium compare to its original position?

After a wave passes through a medium, how does the position of that medium compare to its original position? Light Waves Test Question Bank Standard/Advanced Name: Question 1 (1 point) The electromagnetic waves with the highest frequencies are called A. radio waves. B. gamma rays. C. X-rays. D. visible light.

More information

Atoms Absorb & Emit Light

Atoms Absorb & Emit Light Atoms Absorb & Emit Light Spectra The wavelength of the light that an element emits or absorbs is its fingerprint. Atoms emit and absorb light First Test is Thurs, Feb 1 st About 30 multiple choice questions

More information

CHAPTER 2: Electromagnetic Radiation Principles

CHAPTER 2: Electromagnetic Radiation Principles CHAPTER 2: Electromagnetic Radiation Principles REFERENCE: Remote Sensing of the Environment John R. Jensen (2007) Second Edition Pearson Prentice Hall DETECTING THE REMOTE SIGNAL 1 Electromagnetic Energy

More information

Physics 1010: The Physics of Everyday Life. TODAY Black Body Radiation, Greenhouse Effect

Physics 1010: The Physics of Everyday Life. TODAY Black Body Radiation, Greenhouse Effect Physics 1010: The Physics of Everyday Life TODAY Black Body Radiation, Greenhouse Effect 1 Admin Stuff Exams are at back of room, alphabetically in four piles. Please collect AFTER class Grades posted

More information

D.S. Boyd School of Earth Sciences and Geography, Kingston University, U.K.

D.S. Boyd School of Earth Sciences and Geography, Kingston University, U.K. PHYSICAL BASIS OF REMOTE SENSING D.S. Boyd School of Earth Sciences and Geography, Kingston University, U.K. Keywords: Remote sensing, electromagnetic radiation, wavelengths, target, atmosphere, sensor,

More information

Heating the Atmosphere. Dr. Michael J Passow

Heating the Atmosphere. Dr. Michael J Passow Heating the Atmosphere Dr. Michael J Passow Heat vs. Temperature Heat refers to energy transferred from one object to another Temperature measures the average kinetic energy in a substance. When heat energy

More information

Assembly & Use Instructions -- Stanford Spectrographs

Assembly & Use Instructions -- Stanford Spectrographs Assembly & Use Instructions -- Stanford Spectrographs Instructions You ll need: Spectrograph poster, diffraction grating, adhesive tape NOTE: Try not to touch the grating material, since the oils on your

More information

3.1 Photoelectricity AS13. 3.1 Photo-electricity 2

3.1 Photoelectricity AS13. 3.1 Photo-electricity 2 Photo-electricity Einstein s quantum explanation of the photoelectric effect - Einstein used Planck s quantum theory of radiation, (see Revision Card AS1), to explain photoelectric emission. He assumed

More information

Astro 130, Fall 2011, Homework, Chapter 17, Due Sep 29, 2011 Name: Date:

Astro 130, Fall 2011, Homework, Chapter 17, Due Sep 29, 2011 Name: Date: Astro 130, Fall 2011, Homework, Chapter 17, Due Sep 29, 2011 Name: Date: 1. If stellar parallax can be measured to a precision of about 0.01 arcsec using telescopes on Earth to observe stars, to what distance

More information

ATM S 111, Global Warming: Understanding the Forecast

ATM S 111, Global Warming: Understanding the Forecast ATM S 111, Global Warming: Understanding the Forecast DARGAN M. W. FRIERSON DEPARTMENT OF ATMOSPHERIC SCIENCES DAY 1: OCTOBER 1, 2015 Outline How exactly the Sun heats the Earth How strong? Important concept

More information

Treasure Hunt. Lecture 2 How does Light Interact with the Environment? EMR Principles and Properties. EMR and Remote Sensing

Treasure Hunt. Lecture 2 How does Light Interact with the Environment? EMR Principles and Properties. EMR and Remote Sensing Lecture 2 How does Light Interact with the Environment? Treasure Hunt Find and scan all 11 QR codes Choose one to watch / read in detail Post the key points as a reaction to http://www.scoop.it/t/env202-502-w2

More information

ILLUSTRATIVE EXAMPLE: Given: A = 3 and B = 4 if we now want the value of C=? C = 3 + 4 = 9 + 16 = 25 or 2

ILLUSTRATIVE EXAMPLE: Given: A = 3 and B = 4 if we now want the value of C=? C = 3 + 4 = 9 + 16 = 25 or 2 Forensic Spectral Anaylysis: Warm up! The study of triangles has been done since ancient times. Many of the early discoveries about triangles are still used today. We will only be concerned with the "right

More information

12-3. Spherical groups of millions of stars found in the Milky Way are called: a) novas b) globular clusters X c) open clusters d) galactic clusters

12-3. Spherical groups of millions of stars found in the Milky Way are called: a) novas b) globular clusters X c) open clusters d) galactic clusters Chapter 12 Quiz, Nov. 28, 2012, Astro 162, Section 4 12-1. Where in our Galaxy has a supermassive (or galactic) black hole been observed? a) at the outer edge of the nuclear bulge b) in the nucleus X c)

More information

The Experimental Basis of Quantum Theory

The Experimental Basis of Quantum Theory The Experimental Basis of Quantum Theory Preliminary Remarks New theories do not appear from nowhere, they are usually based on (unexplained) experimental results. People have to be ready for it, e.g.

More information

Blackbody radiation derivation of Planck s radiation low

Blackbody radiation derivation of Planck s radiation low Blackbody radiation derivation of Planck s radiation low 1 Classical theories of Lorentz and Debye: Lorentz (oscillator model): Electrons and ions of matter were treated as a simple harmonic oscillators

More information

Lightbulbs. How does a lightbulb work? Lightbulbs. Electromagnetic radiation. End of semester grade policy. Electric Current

Lightbulbs. How does a lightbulb work? Lightbulbs. Electromagnetic radiation. End of semester grade policy. Electric Current Pressure Lecture 17 : Incandescent lightbulbs How they work Why they are inefficient Lightbulbs How many scientists does it take to change a lightbulb? Undergraduates: None Bright light - hurts... must

More information

Electromagnetic Radiation (EMR) and Remote Sensing

Electromagnetic Radiation (EMR) and Remote Sensing Electromagnetic Radiation (EMR) and Remote Sensing 1 Atmosphere Anything missing in between? Electromagnetic Radiation (EMR) is radiated by atomic particles at the source (the Sun), propagates through

More information

Finding The Energy of a Photon. F Scullion Some useful rearrangement triangles. Also note that 1 mole = 6.

Finding The Energy of a Photon. F Scullion  Some useful rearrangement triangles. Also note that 1 mole = 6. 1 Atomic Theory. Finding The Energy of a Photon F Scullion www.justchemy.com Some useful rearrangement triangles The Relationship between light and energy Converting frequency to wavelength Also note that

More information

nm cm meters VISIBLE UVB UVA Near IR 200 300 400 500 600 700 800 900 nm

nm cm meters VISIBLE UVB UVA Near IR 200 300 400 500 600 700 800 900 nm Unit 5 Chapter 13 Electrons in the Atom Electrons in the Atom (Chapter 13) & The Periodic Table/Trends (Chapter 14) Niels Bohr s Model Recall the Evolution of the Atom He had a question: Why don t the

More information

Review Vocabulary spectrum: a range of values or properties

Review Vocabulary spectrum: a range of values or properties Standards 7.3.19: Explain that human eyes respond to a narrow range of wavelengths of the electromagnetic spectrum. 7.3.20: Describe that something can be seen when light waves emitted or reflected by

More information

OSE 6938P. Flat Panel Displays

OSE 6938P. Flat Panel Displays OSE 6938P Flat Panel Displays Prof. Shin-Tson Wu College of Optics & Photonics University of Central Florida http://lcd.creol.ucf.edu/ Email: swu@mail.ucf.edu Office: CREOL 280 Phone: 407-823-4763 1 OSE

More information

THE NATURE OF LIGHT AND COLOR

THE NATURE OF LIGHT AND COLOR THE NATURE OF LIGHT AND COLOR THE PHYSICS OF LIGHT Electromagnetic radiation travels through space as electric energy and magnetic energy. At times the energy acts like a wave and at other times it acts

More information

The Earth s Atmosphere

The Earth s Atmosphere THE SUN-EARTH SYSTEM III The Earth s Atmosphere Composition and Distribution of the Atmosphere The composition of the atmosphere and the way its gases interact with electromagnetic radiation determine

More information

Determining the Sizes & Distances of Stars Using the H-R Diagram

Determining the Sizes & Distances of Stars Using the H-R Diagram Determining the Sizes & Distances of Stars Using the H-R Diagram Activity UCIObs 11 College Level Source: Copyright (2009) by Tammy Smecker-Hane & Michael Hood. Contact tsmecker@uci.edu with questions.

More information

STOP for science. Light is a wave. Like waves in water, it can be characterized by a wavelength.

STOP for science. Light is a wave. Like waves in water, it can be characterized by a wavelength. INTRODUCTION Most students have encountered rainbows, either spotting them directly on those special days when the raindrops fall while the Sun still finds cloudless regions to peek through, or at least

More information

1 Introduction. Name: 1.1 Spectral Classification of Stars. PHYS-1050 Hertzsprung-Russell Diagram Solutions Spring 2013

1 Introduction. Name: 1.1 Spectral Classification of Stars. PHYS-1050 Hertzsprung-Russell Diagram Solutions Spring 2013 Name: 1 Introduction Read through this information before proceeding on with the lab. 1.1 Spectral Classification of Stars 1.1.1 Types of Spectra Astronomers are very interested in spectra graphs of intensity

More information

PRACTICE EXAM IV P202 SPRING 2004

PRACTICE EXAM IV P202 SPRING 2004 PRACTICE EXAM IV P202 SPRING 2004 1. In two separate double slit experiments, an interference pattern is observed on a screen. In the first experiment, violet light (λ = 754 nm) is used and a second-order

More information

The Relationship Between Wavelength and Frequency in the Electromagnetic Spectrum

The Relationship Between Wavelength and Frequency in the Electromagnetic Spectrum Name The Relationship Between Wavelength and Frequency in the Electromagnetic Spectrum Purpose: To discover and verify the relationship between Wavelength and Frequency of the Electromagnetic Spectrum.

More information

M01/430/H(3) Name PHYSICS HIGHER LEVEL PAPER 3. Number. Wednesday 16 May 2001 (morning) 1 hour 15 minutes INSTRUCTIONS TO CANDIDATES

M01/430/H(3) Name PHYSICS HIGHER LEVEL PAPER 3. Number. Wednesday 16 May 2001 (morning) 1 hour 15 minutes INSTRUCTIONS TO CANDIDATES INTERNATIONAL BACCALAUREATE BACCALAURÉAT INTERNATIONAL BACHILLERATO INTERNACIONAL M01/430/H(3) PHYSICS HIGHER LEVEL PAPER 3 Wednesday 16 May 2001 (morning) Name Number 1 hour 15 minutes INSTRUCTIONS TO

More information

White paper. Lighting for Network Video Lighting Design Guide

White paper. Lighting for Network Video Lighting Design Guide White paper Lighting for Network Video Lighting Design Guide Table of contents 1. Introduction 3 2. What is light? 3 3. What is color? 3 4. What is infrared light? 4 5. Color or monochrome images? 4 6.

More information

Engineering Mini Holiday Lights

Engineering Mini Holiday Lights 1 Engineering Mini Holiday Lights Jeffrey La Favre The small light bulbs we are using for our activities were cut from strings of mini holiday lights. The strings contained 100 light bulbs arranged in

More information

MODULE P7: FURTHER PHYSICS OBSERVING THE UNIVERSE OVERVIEW

MODULE P7: FURTHER PHYSICS OBSERVING THE UNIVERSE OVERVIEW OVERVIEW More than ever before, Physics in the Twenty First Century has become an example of international cooperation, particularly in the areas of astronomy and cosmology. Astronomers work in a number

More information

Integrating the Solar Spectrum

Integrating the Solar Spectrum Integrating the Solar Spectrum PHYS 4400, Principles and Varieties of Solar Energy Instructor: Randy J. Ellingson The University of Toledo January 24, 203 Pop Quiz Note: quiz does not count toward grade

More information

8.2 Cells and Energy. What is photosynthesis? Photosynthesis takes place in the chloroplasts. CHAPTER 8. Solar cells and chloroplasts

8.2 Cells and Energy. What is photosynthesis? Photosynthesis takes place in the chloroplasts. CHAPTER 8. Solar cells and chloroplasts CHAPTER 8 CELL PROCESSES 8.2 Cells and Energy To stay alive, you need a constant supply of energy. You need energy to move, think, grow, and even sleep. Where does that energy come from? It all starts

More information

Infrared Thermometry. Introduction, History, and Applications. Optical Pyrometry. Jason Mershon, Advanced Energy Industries, Inc

Infrared Thermometry. Introduction, History, and Applications. Optical Pyrometry. Jason Mershon, Advanced Energy Industries, Inc Infrared Thermometry Introduction, History, and Applications Jason Mershon, Advanced Energy Industries, Inc In manufacturing environments, measuring the temperature of an object without contact has proven

More information

Photosynthesis. photosynthesis. respiration

Photosynthesis. photosynthesis. respiration Photosynthesis Learning Goals After completing this laboratory exercise you will be able to: 1. Observe the absorption spectrum of the pigment Chlorophyll using a spectroscope. 2. Describe the relationship

More information

Knox Academy, Haddington. Our Dynamic Universe. 4. The Expanding Universe and Big Bang Theory

Knox Academy, Haddington. Our Dynamic Universe. 4. The Expanding Universe and Big Bang Theory Knox Academy, Haddington Our Dynamic Universe 4. The Expanding Universe and Big Bang Theory 2014 Our Dynamic Universe: The Expanding Universe and Big Bang Theory Contents Unit Specification... 2 Notes...

More information

Planetary Energy Balance

Planetary Energy Balance Planetary Energy Balance Electromagnetic Spectrum Different types of radiation enter the Earth s atmosphere and they re all a part of the electromagnetic spectrum. One end of the electromagnetic (EM) spectrum

More information

Introduction to spectroscopy

Introduction to spectroscopy Introduction to spectroscopy How do we know what the stars or the Sun are made of? The light of celestial objects contains much information hidden in its detailed color structure. In this lab we will separate

More information

Using the Spectrophotometer

Using the Spectrophotometer Using the Spectrophotometer Introduction In this exercise, you will learn the basic principals of spectrophotometry and and serial dilution and their practical application. You will need these skills to

More information

MCQ - ENERGY and CLIMATE

MCQ - ENERGY and CLIMATE 1 MCQ - ENERGY and CLIMATE 1. The volume of a given mass of water at a temperature of T 1 is V 1. The volume increases to V 2 at temperature T 2. The coefficient of volume expansion of water may be calculated

More information

Physics/Science *P41764A0120* Edexcel GCSE P41764A. Unit P1: Universal Physics. Higher Tier. Thursday 8 November 2012 Morning Time: 1 hour

Physics/Science *P41764A0120* Edexcel GCSE P41764A. Unit P1: Universal Physics. Higher Tier. Thursday 8 November 2012 Morning Time: 1 hour Write your name here Surname Other names Edexcel GCSE Centre Number Physics/Science Unit P1: Universal Physics Thursday 8 November 2012 Morning Time: 1 hour You must have: Calculator, ruler Candidate Number

More information

Lecture 1. The nature of electromagnetic radiation.

Lecture 1. The nature of electromagnetic radiation. Lecture 1. The nature of electromagnetic radiation. 1. Basic introduction to the electromagnetic field: Dual nature of electromagnetic radiation Electromagnetic spectrum. Basic radiometric quantities:

More information

CO2 Absorption Spectrum

CO2 Absorption Spectrum CO2 Absorption Spectrum There is no Valid Mechanism for CO2 Creating Global Warming Proof one: Laboratory measurements show that carbon dioxide absorbs to extinction at its main peak in 10 meters under

More information

UNIT: Electromagnetic Radiation and Photometric Equipment

UNIT: Electromagnetic Radiation and Photometric Equipment UNIT: Electromagnetic Radiation and Photometric Equipment 3photo.wpd Task Instrumentation I To review the theory of electromagnetic radiation and the principle and use of common laboratory instruments

More information

Chapter 2. The global energy balance. 2.1 Planetary emission temperature

Chapter 2. The global energy balance. 2.1 Planetary emission temperature Chapter 2 The global energy balance We consider now the general problem of the radiative equilibrium temperature of the Earth. The Earth is bathed in solar radiation and absorbs much of that incident upon

More information

Light is a type of electromagnetic (EM) radiation, and light has energy. Many kinds of light exist. Ultraviolet (UV) light causes skin to tan or burn.

Light is a type of electromagnetic (EM) radiation, and light has energy. Many kinds of light exist. Ultraviolet (UV) light causes skin to tan or burn. Light and radiation Light is a type of electromagnetic (EM) radiation, and light has energy. Many kinds of light exist. Ultraviolet (UV) light causes skin to tan or burn. Infrared (IR) light is used in

More information

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A photo cathode whose work function is 2.4 ev, is illuminated with white light that has

More information

CHAPTER 2 Energy and Earth

CHAPTER 2 Energy and Earth CHAPTER 2 Energy and Earth This chapter is concerned with the nature of energy and how it interacts with Earth. At this stage we are looking at energy in an abstract form though relate it to how it affect

More information

Answer: b. Answer: a. Answer: d

Answer: b. Answer: a. Answer: d Practice Test IV Name 1) In a single slit diffraction experiment, the width of the slit is 3.1 10-5 m and the distance from the slit to the screen is 2.2 m. If the beam of light of wavelength 600 nm passes

More information

11.2 THE DOPPLER EFFECT Notes

11.2 THE DOPPLER EFFECT Notes 11.2 THE DOPPLER EFFECT Notes III. HOW THE DOPPLER EFFECT WORKS WITH SOUND A. SOUND FREQUENCY AND PITCH The frequency of sound waves is proportional to the pitch that we hear. DEMO Tuning Forks f = higher

More information

The Sun. Solar radiation (Sun Earth-Relationships) The Sun. The Sun. Our Sun

The Sun. Solar radiation (Sun Earth-Relationships) The Sun. The Sun. Our Sun The Sun Solar Factoids (I) The sun, a medium-size star in the milky way galaxy, consisting of about 300 billion stars. (Sun Earth-Relationships) A gaseous sphere of radius about 695 500 km (about 109 times

More information

Waves Sound and Light

Waves Sound and Light Waves Sound and Light r2 c:\files\courses\1710\spr12\wavetrans.doc Ron Robertson The Nature of Waves Waves are a type of energy transmission that results from a periodic disturbance (vibration). They are

More information

Theremino System Theremino Spectrometer Technology

Theremino System Theremino Spectrometer Technology Theremino System Theremino Spectrometer Technology theremino System - Theremino Spectrometer Technology - August 15, 2014 - Page 1 Operation principles By placing a digital camera with a diffraction grating

More information