1 1 1 Introduction 1.1 The Tunneling Process There are many popular essays about time, history of the universe, teleportation or the possibility of time travel, but not much is reported about tunneling. However, the tunnel process is the basis of the origin of the universe, of the sunshine, and thus of life. It was discovered by Antoine Henri Becquerel ( ), Figure 1.1, in 1886 while investigating the radioactive decay of atomic nuclei. This was then Fig. 1.1 Physicist Antoine Henri Becquerel ( ). He discovered the natural radioactivity. Bettmann/CORBIS Zero Time Space: How Quantum Tunneling Broke the Light Speed Barrier. G. Nimtz and A. Haibel Copyright 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim ISBN:
2 2 1 Introduction Fig. 1.2 The couple Marie and Pierre Curie ( and ) in the laboratory. Bettmann/CORBIS examined more systematically by Marie and Pierre Curie ( and ), Figure 1.2. Marie Curie was a student of Becquerel s and she continued his research. Together with Becquerel the Curies received the Nobel prize in physics for developing and pioneering in the field of spontaneous radioactivity and the phenomena of radiation.theexplanation of α-decay as quantum mechanic tunneling followed around 1928 by George Gamow ( ) and simultaneously, but independently, by Edward U. Condon ( ) and Ronald W. Gurney ( ). Incidentally, in 1927, Friedrich Hund ( ) was the first to notice the possibility of the phenomenon of tunnel-
3 1.1 The Tunneling Process 3 ing, which he called barrier penetration, in a calculation of the ground state in a double-well potential. The phenomenon arises, for example, in the inversion transition of the ammonia molecule, as presented in Section Our knowledge today of quantum cosmology tells us that the universe also came into existence through tunneling, the so-called Big Bang. A stationary state of space and time of infinitely small dimension tunneled into our world and expanded until eventually today s state of our universe was reached. The principle of tunneling can be shown with a simple picture: Particles like photons, electrons, nuclear particles, even atoms and molecules, can surmount mountains, even though they lack the energy to reach the peak. They reach the other side of the mountain by tunneling through it. This process, however, is not easy to understand, the mountains facingthoseparticles,havenotubes,theyarenotmadeof material that through you could get easily. Rather they are impenetrable, insurmountable barriers, which physicists call potential barriers. In the same way as for man a massif is insurmountable, the attraction of the particles in an atomic nucleus seem like an insurmountable barrier. These forces hold the nuclear particles together as in a potential well. For light, which consists of an ensemble of single particles of light so-called photons the electronic shells of atoms, for example, form a barrier. These atoms are tough obstacles for quanta of radiation, like walls for tennis balls. Even so, after some time, particles suddenly succeed in penetrating the apparently insurmountable potential
4 4 1 Introduction mountain. Figure 1.3 is supposed to illustrate this strange tunneling process. The thief would prefer to disappear with his loot through the wall. Fig. 1.3 Burglars would like the tunneling effect. This is made possible by the tunneling process, for instance during the radioactive decay of atoms. Take uranium which, emitting α and β particles (helium nuclei and electrons), decays step by step into radium and eventually into lead. This was discovered by Marie Curie. Since the 20th century radioactive decay of isotopes with a short life time has been frequently used for diagnostic and therapeutic purposes in medicine. Radioactive decay of nuclei is the source of energy in atomic power stations. Tunneling not only makes decay possible but also enables the build up of bigger atomic nuclei, the so-called nuclear fusion. Even in the center of the sun pressures and temperatures are not high enough to bring about nuclear fusion.
5 1.1 The Tunneling Process 5 The hydrogen nuclei (also called protons) cannot manage to overcome the repulsive electric barriers. Helium nuclei can not, therefore, be built up. If, in spite of this, some hydrogen nuclei do manage to reach the valley and fuse then this is also caused by tunneling. Hydrogen nuclei fuse into helium nuclei and as a result release solar energy. 1 The most fascinating aspect of the tunneling process is that the tunneling particles not only penetrate potential barriers of any size, but at the same time also show an extraordinary time behavior. Both are part of the quantum mechanical nature of the tunneling process. In this, particles seem to travel with infinitely high speed through barrier spaces, which means in zero time and thus incomparably faster than light. Light travels fast, but at a speed which is still finite and measurable. In the tunnel, however, no time exists. In a figurative sense one could say, nothing happens in a tunnel, there is eternity. Contrary to existing ideas timelessness, which is eternity, is synonymous with the total absence of events, simply boring. Tunneling in a way is as difficult to understand as Heisenberg s relation of uncertainty. It proves that you can either measure with high precision the location or the velocity of a particle, but not both at the same time. The tunneling 1) In the most terrible weapon known to mankind, the Hydrogen bomb, both processes, nuclear decay and nuclear fusion are used. First radioactive decay is ignited. Thereby electrically positively charged atomic particles, protons, are heated to millions of degrees Celsius. Through a fusion of protons another powerful burst of energy is set free. Such a hybrid bomb can release an energy equal to 60 million tons of the classical chemical TNT (trinitrotoluene).
6 6 1 Introduction process and the relation of uncertainty are quantum mechanical effects which force us to revise our ideas of space and time. Since the theory of quantum mechanics was introduced about a hundred years ago no contradiction of it has been found. Of course, this theory of ours will also not be able to describe the world for ever, but ever more frequently its validity is confirmed in all fields of physics. For instance quantum mechanics is frequently used in many applications in modern semiconductor technology or in optoelectronics. Generally, standardized measures for time and signal traveling time are being used in all technologies. Therefore tunneling with its unusual time behavior provokes not only fundamental questions in theoretical and applied physics, but also philosophical and theological questions concerning space and time. 1.2 Time, Space and Velocity In the 5th century the philosopher Aurelius Augustinus (St. Augustine), Figure 1.4, wrote about time in his confessions: What then is time? If nobody asks me, then I know, if I want to explain it, I don t know. Even so I maintain to know confidently, there wouldn t be a past time, if nothing had passed, no future time could be, if nothing came towards us and the present time could not be experienced, if nothing existed.
7 1.2 Time, Space and Velocity 7 Fig. 1.4 Philosopher and Theologian St.Augustine ( ). Bettmann/CORBIS This statement hits the point, time is difficult if not impossible to describe. In any case, time describes an experience, an event. To the classical physicist time is a measurable experience. (For one hour I suffered from a terrible toothache; I spent an exciting week diving in coral reefs.) Past, present and future are measurable and, for the traditional physicist, they are universally applicable, independent of place and movement.
8 8 1 Introduction Fig. 1.5 Portrait of Galileo Galilei around Bettmann/CORBIS Around 1600 Galileo Galilei ( ), Figure 1.5, watched the oscillation behavior of a chandelier which was hanging from the ceiling in Pisa cathedral, swinging in the draught, Figure 1.6. He was curious whether the time of swinging depended on the amplitude. He did not have a watch, so he used his heartbeat and the rhythm of certain melodies for time keeping. He discovered, that the swinging time of a pendulum depended on its length, not its weight. He claimed, swinging time was independent of amplitude, which is not exactly true, as we know today. Isaac Newton ( ), Figure 1.7, assumed around 1700, like many others right up to the end of the 19th century, that time was an absolute quantity. Today we know
9 1.2 Time, Space and Velocity 9 Fig. 1.6 Galileo Galilei studied the pendulousness of a candelabrum at the cathedral of Pisa. Painting of Luigi Sabatellio, Florenz, Museo di Fisica e Storia Naturale. Archivo Iconografico, S.A./CORBIS that this is not the case. There is no objective time, no absolute time. The passing of time depends on the movements of the observer and of what is being observed. Time was degraded by Einstein s theory of relativity to a relative quantity. In quantum mechanics time is not even an observable, which means measurable, quantity. Although the tunnel diode has been used as an electronic device since 1962, the time which a particle spends tunneling in the mountain was neither theoretically nor experi-
10 10 1 Introduction Fig. 1.7 Portrait of Sir Isaac Newton in the year of CORBIS mentally revealed. In this electronic device electrons tunnel through a mountain which, in semiconductors, separates the so-called valence band from the conduction band. The mountain is called a forbidden band gap. The consequence of this tunneling is that this material, when in contact with a certain voltage supply, abruptly becomes a strong electric conductor. It is like using a switch, one suddenly gets a high current. The time electrons spend tunneling barriers in this
11 1.2 Time, Space and Velocity 11 often used device could not be defined until now. The cause of the problem measuring the tunneling time of electrons will be dealt with later. Microwave signals (built up by light particles, so-called photons, which are quanta of electromagnetic waves, part of which are γ- and X-rays and light, as well as microwaves) were first measured by Achim Enders and Günter Nimtz in 1991/1992 at the University of Cologne . These experiments in Cologne were provoked by an article in the journal Applied Physics Letters in 1991 . In this, four Italian colleagues in Florence claimed that the speed of microwaves in the tunneling barrier measured by them was distinctly less than the speed of light in vacuum. Günter Nimtz, coauthor of this book, realized that these measurements could not be correct. He discussed this with Prof. Enders, at the time working with him in Cologne, who had developed a highly sensitive microwave apparatus, albeit for entirely different purposes. Enders got excited and pressed for an immediate repetition of the tunneling experiments. The following weekends were used to define the obscure tunneling speed. Initially, neither was aware of the fundamental question related to time behavior in the tunneling process. They were driven by sheer curiosity and ambition to reveal the secret of the tunneling time. Contrary to their Italian colleagues, Enders and Nimtz observed an infinite signal velocity in the tunnel. According to their findings, the spread of the signal pulse was timeless in the barrier, it was instantaneous. The signal was spread across the entire tunneling barrier in zero time. It did not
12 12 1 Introduction need any time to get from the entrance to the exit of the tunneling barrier. In physics this is called non-locality in time, in theology omnipresent. A very short time delay happens, however, at the entrance of a barrier. This time effect will be discussed in detail in Section Seen from everyday life, this surprising result collides with many respectable publications with regard to Einstein causality, which postulates that nothing can move faster than the velocity of light. Which means that energies and signals cannot spread faster than the velocity of light. According to most books on the special theory of relativity a velocity beyond the velocity of light would allow a manipulation of the past, see for instance Refs. [2, 6]. Einstein causality, however, can only be applied mathematically correct, to the propagation of infinitely short signals . This, however, cannot be applied to particles and signals which possess a natural time duration nor to the tunneling process, which can only be explained by quantum mechanics. Not even an infinite signal velocity can change the primitive principle of causality: cause precedes effect. The past cannot be changed by superluminal signal velocity. (Physicists distinguish between superluminal (faster than light) and subluminal (slower than light) propagation of waves). For science fiction this means there cannot be a time machine, no manipulation of the past. In Section 5.5 the principle of causality will be discussed extensively. By the way, the Italian scientists, who had initiated the microwave experiments as a test for tunneling velocity, confirmed the correct Cologne results in the journal Physical Review .
13 1.2 Time, Space and Velocity 13 Quite a few physicists believe, that a superluminal signal velocity is impossible and cannot be accepted. Their comments on this subject are rather emotional. Heated disputes can be found in professional and popular science media and of course on the internet. This discussion deserves attention, as measurement of superluminal digital signal transmission was demonstrated several years ago on a modern glass fiber line in a laboratory of the Corning company. We shall discuss this superluminal signal experiment in more detail in Section Professor Raymond Chiao at Berkley University supports the impossibility of superluminal signal transmission. He is a pupil of the Nobel prize winner Townes, who took part in the discovery of the MASER LASER. In many articles and discussions, Chiao points out that superluminal signal transmission is simply not permissible. Interestingly, however, members of his own laboratory at Berkeley have demonstrated that quanta of light have tunneled at superluminal speeds. Measurements with the same experimental set-up confirmed that group velocity and energy velocities are superluminal . AttheLakeGardameeting Mysteries, Puzzles and Paradoxes in 1998 Prof. Rudolfo Bonifacio of the University of Milan ascertained: The detector clicks faster, when a photon has gone through a tunnel than when it has traveled at the speed of light. Therefore the photon which has gone through the tunnel was registered as superluminal.
14 14 1 Introduction Recently physicists like Markus Büttiker and Sean Washburn contributed to this subject in Nature (March 20th, 2003), claiming signal velocity must be slower than the velocity of light in a vacuum . This claim cannot be correct as all light velocities are equal in vacuum, whether the velocity of energy, signal, group or phase of electromagnetic waves. In the end the authors attenuated single photons in order to rescue the subluminal signal velocity in their theoretical model. However, a single quantum of light cannot be attenuated in the elastic tunneling process. These quanta can be reflected or tunneled, but exist only virtually in a barrier as they do not spend time in traversing the barrier. In compliance with their text, the authors wanted to reduce the energy of single photons, which are the smallest units of electromagnetic waves, and thereby reduce Planck s constant? The problem s solution lies in three often overlooked properties of the tunneling process and of a signal. We are going to deal with this in detail in Chapter 5: The tunneling process is part of Quantum Mechanics and cannot be described by the special theory of relativity. Physical signals are frequency band limited as we are familiar with, for instance, acoustic high fidelity signals having a frequency band up to 20 khz. If the frequency band limitation were not the case, signals would need infinite energy.
15 1.2 Time, Space and Velocity 15 Superluminal signal speed does not violate the primitive causality saying that cause and effect cannot be exchanged. In 1962 a publication on the theory of quantum mechanics was presented by Thomas Hartman, who described all known superluminal phenomena of tunneling and exposed all subsequent theoretical efforts as wrong or superfluous. This was dealt with at length by Steve Collins and his colleague in the The quantum mechanical tunneling time problem revisited  and also by Günter Nimtz and Astrid Haibel in Basics of Superluminal Signals . Recently, several physicists, first in France then in the United States, even measured negative speeds of light pulses. The result was that the peak of a pulse arrived at the exit of a medium before it had reached the entrance. Consequently, the speed of the peak traveled in the opposite direction in this special medium. Again the principle of causality does not suffer any damage, as the envelope of the pulse becomes reshaped, which means the peak of the pulse does not happen before the beginning of the original signal. Apart from that, the original information cannot be recognized anymore. In this context it is interesting that two famous physicists, Arnold Sommerfeld ( ) and Léon Brillouin ( ), had already in 1914 calculated a negative group velocity in a case similar to the one just mentioned. Brillouin, however, claims in his famous book Wave Propagation and Group Velocity that a negative group velocity has no physical meaning . Many decades later modern sophisticated
16 16 1 Introduction electronic equipment made it possible to prove the possibility of an allegedly non-physical negative group velocity. The counterpart of superluminal and negative velocities also got into the headlines recently: slowed down and stopped light. This phenomenon of slowing down light does not contradict Einstein s special relativity, but again is a quantum mechanical process which cannot be explained by the classical physics of Newton and Maxwell. This book shows and explains the strange behavior of time and therewith velocity of tunneling. Our introductory chapters therefore deal with these fundamental physical concepts and quantities time, space, and speed, extensively. Our understanding of these quantities has changed drastically during the last three centuries. Time is no longer regarded as absolute and signal and energy speeds are limited in their quantity by the speed of light in a vacuum. The tunnel process is something that cannot be explained by classical physics nor by the special theory of relativity, only by quantum mechanics and quantum electrodynamics. After the introductory chapters we shall explain the spectacular qualities of tunneling. Our final sections deal with the problem of violating Einstein causality and also with superluminal phenomena, which follow speculatively from the general theory of relativity.
DO PHYSICS ONLINE FROM QUANTA TO QUARKS QUANTUM (WAVE) MECHANICS Quantum Mechanics or wave mechanics is the best mathematical theory used today to describe and predict the behaviour of particles and waves.
Chapter 18: The Structure of the Atom 1. For most elements, an atom has A. no neutrons in the nucleus. B. more protons than electrons. C. less neutrons than electrons. D. just as many electrons as protons.
Physics and Chemistry 1501 Nuclear Science Part I Atomic bombs, nuclear power plants, and the sun are powered as the result of releasing of nuclear energy. (Read objectives on screen.) In this program,
1 2 "in recognition of the services he rendered to the advancement of Physics by his discovery of energy quanta". h is the Planck constant he called it the quantum of action 3 Newton believed in the corpuscular
CHAPTER 0 2 SECTION Nuclear Changes Nuclear Fission and Fusion KEY IDEAS As you read this section, keep these questions in mind: What holds the nucleus of an atom together? What happens when the nucleus
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
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
Energy Part II Non-Mechanical Energy Wait a minute if all energy is either kinetic or potential and TME = KE + PE then how can there possibly be such thing as non-mechanical energy!?!? Mechanical Energy
Summary of Important Ideas in Quantum Physics 1) The Universe is quantized. Familiar quantities such as energy, momentum, electric charge, mass possibly even time and space are not continuous. They occur
.1.1 Measure the motion of objects to understand.1.1 Develop graphical, the relationships among distance, velocity and mathematical, and pictorial acceleration. Develop deeper understanding through representations
TIME, SYMMETRY OF Although everyday experience leads us to believe that time "flows" in one direction, the equations of both classical and modern physics work equally well in either time direction. Since
Build Your Own Universe You will need: At least 10,000,000,000,000,00 0,000,000,000,000,000,000,00 0,000,000,000,000,000,000,00 0,000,000,000,000,000,000,00 0,000 x Down quarks At least 10,000,000,000,000,000,
Quantum Phenomena and the Theory of The Mechanics of the Very Small Waseda University, SILS, Introduction to History and Philosophy of Science . Two Dark Clouds In 1900 at a Friday Evening lecture at the
Atomic structure This worksheet and all related files are licensed under the Creative Commons Attribution License, version 1.0. To view a copy of this license, visit http://creativecommons.org/licenses/by/1.0/,
Activity 17 Electromagnetic Radiation Why? Electromagnetic radiation, which also is called light, is an amazing phenomenon. It carries energy and has characteristics of both particles and waves. We can
Does Quantum Mechanics Make Sense? Some relatively simple concepts show why the answer is yes. Size Classical Mechanics Quantum Mechanics Relative Absolute What does relative vs. absolute size mean? Why
Lecture 15 Fundamentals of Physics Phys 120, Fall 2015 Cosmology A. J. Wagner North Dakota State University, Fargo, ND 58108 Fargo, October 20, 2015 Overview A history of our view of the universe The Big
Discovery Antoine Henri Becquerel was born in Paris on December 15, 1852 Summit Environmental Technologies, Inc. Analytical Laboratories 3310 Win Street Cuyahoga Falls, Ohio 44223 Fax: 1-330-253-4489 Call
2 WHAT EMERGED FROM THE BIG BANG? David Christian explains how the Big Bang theory developed during the 20th century. This three-part lecture focuses on how the evidence for the expansion of the Universe
5.1 Evolution of the Atomic Model Studying the atom has been a fascination of scientists for hundreds of years. Even Greek philosophers, over 2500 years ago, discussed the idea of there being a smallest
Introduction Until the early 20 th century physicists used to explain the phenomena in the physical world around them using theories such a mechanics, electromagnetism, thermodynamics and statistical physics
The Special Theory of Relativity explained to children (from 7 to 107 years old) Charles-Michel Marle email@example.com Université Pierre et Marie Curie, Paris, France Albert Einstein Century International
Tunnel Effect: - particle with kinetic energy E strikes a barrier with height U 0 > E and width L - classically the particle cannot overcome the barrier - quantum mechanically the particle can penetrated
THE STATISTICAL TREATMET OF EXPERIMETAL DATA Introduction The subject of statistical data analysis is regarded as crucial by most scientists, since error-free measurement is impossible in virtually all
Principles of Imaging Science I (RAD119) Electromagnetic Radiation Energy Definition of energy Ability to do work Physicist s definition of work Work = force x distance Force acting upon object over distance
Albert Einstein and the Miracle Year Special Relativity The year 1905 is often referred to as the Annus Mirabilis (or year of miracles). In this year, Albert Einstein, a 23-year old with an undergraduate
Fundamental Particles, Fundamental Questions Elizabeth H. Simmons Dean and Professor, Lyman Briggs College The smallest pieces of matter Nuclear physics and particle physics study the smallest known building
PHYS 1624 Physics I An introduction to mechanics, heat, and wave motion. This is a calculus- based course for Scientists and Engineers. 4 hours (3 lecture/3 lab) Prerequisites: Credit for MATH 2413 (Calculus
PHYSICAL WORLD Heat & Energy GOD S DESIGN 4th Edition Debbie & Richard Lawrence God s Design for the Physical World is a complete physical science curriculum for grades 3 8. The books in this series are
Nuclear Reactions- chap.31 Fission vs. fusion mass defect..e=mc 2 Binding energy..e=mc 2 Alpha, beta, gamma oh my! Definitions A nucleon is a general term to denote a nuclear particle - that is, either
I The Sun and Solar Energy One of the most important forces behind global change on Earth is over 90 million miles distant from the planet. The Sun is the ultimate, original source of the energy that drives
Radioactivity Emission of high energy photons and particles Alpha, Beta and Gamma Rays Elements heavier than lead (Z=82), are radioactive Radioactive materials emit: alpha particles (helium nucleus) beta
Physical Principle of Formation and Essence of Radio Waves Anatoli Bedritsky Abstract. This article opens physical phenomena which occur at the formation of the radio waves, and opens the essence of the
Introduction to Nuclear Physics 1. Atomic Structure and the Periodic Table According to the Bohr-Rutherford model of the atom, also called the solar system model, the atom consists of a central nucleus
Special Theory of Relativity A Brief introduction Classical Physics At the end of the 19th century it looked as if Physics was pretty well wrapped up. Newtonian mechanics and the law of Gravitation had
In the Middle Ages, individuals called alchemists spent a lot of time trying to make gold. Often, they fooled people into believing that they had made gold. Although alchemists never succeeded in making
Chapter 5 History of the Atom & Atomic Theory You re invited to a Thinking Inside the Box Conference Each group should nominate a: o Leader o Writer o Presenter You have 5 minutes to come up with observations
2 8. Newton's Law Gravitation Rev.nb 8. Newton's Law of Gravitation Introduction and Summary There is one other major law due to Newton that will be used in this course and this is his famous Law of Universal
Where is Fundamental Physics Heading? Nathan Seiberg IAS Apr. 30, 2014 Disclaimer We do not know what will be discovered. This is the reason we perform experiments. This is the reason scientific research
Electron Orbits In an atom model in which negatively charged electrons move around a small positively charged nucleus stable orbits are possible. Consider the simple example of an atom with a nucleus of
WAVES AND ELECTROMAGNETIC RADIATION All waves are characterized by their wavelength, frequency and speed. Wavelength (lambda, ): the distance between any 2 successive crests or troughs. Frequency (nu,):
Name: Class: Date: ID: A PS Chapter 1 Review Multiple Choice Identify the choice that best completes the statement or answers the question. 1. The two main branches of science are a. physics and chemistry.
Unamended Quantum Mechanics Rigorously Implies Awareness Is Not Based in the Physical Brain Casey Blood, PhD Professor Emeritus of Physics, Rutgers University www.quantummechanicsandreality.com CaseyBlood@gmail.com
Main properties of atoms and nucleus. Atom Structure.... Structure of Nuclei... 3. Definition of Isotopes... 4. Energy Characteristics of Nuclei... 5. Laws of Radioactive Nuclei Transformation... 3. Atom
Chapter 4 & 25 Notes Atomic Structure and Nuclear Chemistry Page 1 DEFINING THE ATOM Early Models of the Atom In this chapter, we will look into the tiny fundamental particles that make up matter. An atom
Nuclear Power The True meaning Of Nuclear Power On Earth Basics of Fission Nuclear Fission is the division of generally large and unstable elements (like uranium and plutonium) into smaller elements Nuclear
Basics of Nuclear Physics and Fission A basic background in nuclear physics for those who want to start at the beginning. Some of the terms used in this factsheet can be found in IEER s on-line glossary.
9 th Grade Physical Science Springfield Local Schools Common Course Syllabi Course Description The purpose of the Physical Science course is to satisfy the Ohio Core science graduation requirement. The
Exercises 131 The Falling Apple (page 233) 1 Describe the legend of Newton s discovery that gravity extends throughout the universe According to legend, Newton saw an apple fall from a tree and realized
Einstein s Theory of Special Relativity Made Relatively Simple! by Christopher P. Benton, PhD Young Einstein Albert Einstein was born in 1879 and died in 1955. He didn't start talking until he was three,
The quantum understanding of pre-university physics students Gren Ireson Department of Education, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK Students in England and Wales wishing
DSH 2004 THE CURRENT-VOLTAGE CHARACTERISTICS OF AN LED AND A MEASUREMENT OF PLANCK S CONSTANT Physics 258/259 I. INTRODUCTION Max Planck (1858-1947) was an early pioneer in the field of quantum physics.
The Bohr model for the electrons Electronic structure how the electrons are arranged inside the atom Applying the quantum principle of energy Two parameters: Energy Position Learning objectives Describe
PHOTOELECTRIC EFFECT AND DUAL NATURE OF MATTER AND RADIATIONS 1. Photons 2. Photoelectric Effect 3. Experimental Set-up to study Photoelectric Effect 4. Effect of Intensity, Frequency, Potential on P.E.
Democritus (460 B.C.E.) and the Greek Philosophers Before we discuss the experiments and evidence that have convinced scientists matter is made up of atoms, it is only fair to credit the man who proposed
Department of Physics and Astronomy Goals and Learning Outcomes 1. Students know basic physics principles [BS, BA, MS] 1.1 Students can demonstrate an understanding of Newton s laws 1.2 Students can demonstrate
Chapter 15 Generally Covariant Quantum Mechanics by Myron W. Evans, Alpha Foundation s Institutute for Advance Study (AIAS). (firstname.lastname@example.org, www.aias.us, www.atomicprecision.com) Dedicated to the Late
The Hydrogen Atom Is a Magnet Nuclear Magnetic Resonance Spectroscopy (NMR) Proton NMR A hydrogen nucleus can be viewed as a proton, which can be viewed as a spinning charge. As with any spinning charge,
Science Standard 3 Energy and Its Effects Grade Level Expectations Science Standard 3 Energy and Its Effects The flow of energy drives processes of change in all biological, chemical, physical, and geological
NOTES ON The Structure of the Atom Chemistry is the study of matter and its properties. Those properties can be explained by examining the atoms that compose the matter. An atom is the smallest particle
The Photoelectric Effect. The Wave particle duality of light Light, like any other E.M.R (electromagnetic radiation) has got a dual nature. That is there are experiments that prove that it is made up of
The 67 th Compton Lecture Series at the University of Chicago Seeing and Believing: Detection, Measurement, and Inference in Experimental Physics Kathryn Schaffer, lecturer Notes and thoughts for Lecture
Evolution of the Universe from 13 to 4 Billion Years Ago Prof. Dr. Harold Geller email@example.com http://physics.gmu.edu/~hgeller/ Department of Physics and Astronomy George Mason University Unity in the
As you know, some substances are made up of only one kind of atom and these substances are called elements. You already know something about a number of elements you ve heard of hydrogen, helium, silver,
What Energy Drives the Universe? Andrei Linde Two major cosmological discoveries:! The new-born universe experienced rapid acceleration (inflation)! A new (slow) stage of acceleration started 5 billion
name Pre-lab The Origin of the Elements Introduction Have you ever wondered where all the matter around us comes from? It must have been created somewhere in this universe. In this exercise you will learn
Quantum Mechanics and Atomic Structure 1 INTRODUCTION The word atom is derived from the Greek word, atomos, which means uncut or indivisible. It was Dalton (1808) who established that elementary constituents
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
CHAPTER 6 ATOMIC ORBITS AND PHOTONS Mass and Radiation Quantum of action and Planck's constant Particle waves and fixed atomic orbits The Photon The velocity of light Only a few hundred years ago Copernicus
Chapter 2: Electromagnetic Radiation Radiant Energy I Goals of Period 2 Section 2.1: To introduce electromagnetic radiation Section 2.2: To discuss the wave model of radiant energy Section 2.3: To describe
Lecture 40 Chapter 34 Nuclear Fission & Fusion Nuclear Power Final Exam - Monday Dec. 20, 1045-1315 Review Lecture - Mon. Dec. 13 7-Dec-10 Short-Range Strong Nuclear Force The strong force is most effective
Nuclear fission and fusion P2 62 minutes 62 marks Page of 23 Q. Nuclear power stations use the energy released from nuclear fuels to generate electricity. (a) Which substance do the majority of nuclear
Name: _Answer key Pretest: _2_/ 58 Posttest: _58_/ 58 Pretest Ch 20: Origins of the Universe Vocab/Matching: Match the definition on the left with the term on the right by placing the letter of the term
Name: Teacher: Pd. Date: Science Tutorial TEK 6.9C: Energy Forms & Conversions TEK 6.9C: Demonstrate energy transformations such as energy in a flashlight battery changes from chemical energy to electrical
The Birth of the Universe Newcomer Academy High School Visualization One Chapter Topic Key Points of Discussion Notes & Vocabulary 1 Birth of The Big Bang Theory Activity 4A the How and when did the universe
Transcript 22 - Universe A few introductory words of explanation about this transcript: This transcript includes the words sent to the narrator for inclusion in the latest version of the associated video.
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
Appendix A: Science Practices for AP Physics 1 and 2 Science Practice 1: The student can use representations and models to communicate scientific phenomena and solve scientific problems. The real world
AP Chemistry A. Allan Chapter 7 Notes - Atomic Structure and Periodicity 7.1 Electromagnetic Radiation A. Types of EM Radiation (wavelengths in meters) 10-1 10-10 10-8 4 to 7x10-7 10-4 10-1 10 10 4 gamma
Curriculum Overview IB Physics SL YEAR 1 JUNIOR TERM I (2011) Resources: Gregg Kerr, Nancy Kerr, (2004) Physics International Baccalaureate, IBID Press, Victoria, Australia. Tim Kirk and Neil Hodgson Physics
A Modest View of Bell s Theorem Steve Boughn, Princeton University and Haverford College Talk given at the 2016 Princeton-TAMU Symposium on Quantum Noise Effects in Thermodynamics, Biology and Information
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
Get Energized! What are two types of energy? Energy is the ability to cause change. Energy takes many different forms and causes many different effects. There are two general types of energy: kinetic energy
Unit 1: Atoms Level 3 Achievement Scale Can state the key results of the experiments associated with Dalton, Rutherford, Thomson, Chadwick, and Bohr and what this lead each to conclude. Can explain that
Atomic Structure: Chapter Problems Bohr Model Class Work 1. Describe the nuclear model of the atom. 2. Explain the problems with the nuclear model of the atom. 3. According to Niels Bohr, what does n stand
PHYSICS FOUNDATIONS SOCIETY THE DYNAMIC UNIVERSE TOWARD A UNIFIED PICTURE OF PHYSICAL REALITY TUOMO SUNTOLA Published by PHYSICS FOUNDATIONS SOCIETY Espoo, Finland www.physicsfoundations.org Printed by
Emission of Light & Atomic Models 1 Objective At the end of this activity you should be able to: o Explain what photons are, and be able to calculate their energies given either their frequency or wavelength.
Boltzmann Distribution Law The motion of molecules is extremely chaotic Any individual molecule is colliding with others at an enormous rate Typically at a rate of a billion times per second We introduce
half-life Number of particles left The half-life of an element tells us how long it will take for half of the nuclei in a sample of an unstable element to decay. So, after one half-life, only half of the
1 Pre-Test Directions: This will help you discover what you know about the subject of motion before you begin this lesson. Answer the following true or false. 1. Aristotle believed that all objects fell