Physics 121: Optics, Electricity & Magnetism
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1 Physics 121: Optics, Electricity & Magnetism Neil Alberding SFU Physics Spring 2010 Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
2 Outline I Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
3 Acknowledgements Lecture Slides: Dugan O Neil, Spring 2009 Demonstrations: Jeff Rudd Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
4 Phys 121, Phys 126 and Phys 141 There are at least two options for optics, electricity and magnetism this term. Phys 121 is one choice, Phys 126 is the other. Similar list of topics (interchangeable for upper-level prerequisites) Phys 126 is faster-paced, a somewhat more challenging. However, grading scale is higher. In Spring people in Phys 121 and 22 people in Phys 126 If you have some sort of A in Phys 120 then you can go into Phys 126 instead of Phys 121. Phys 141 is a combined lab/lecture/tutorial class, Studio Physics, and is open only to those who have taken Physics 140. Class size is max 54. It s in Surrey. Phys 131 is the lab course. Should be taken in conjunction with Phys 121. We will try to correlate the two, but complete correspondence isn t possible. Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
5 Introduction Physics 121: Optics, Electricity & Magnetism Time/Rm: MWF: 9:30 Rm: B9201 Tutorials: Tues or Thurs start next week. Instructor: Neil Alberding Textbook: Physics for Scientists and Engineers, Second Edition Randall D. Knight Office Hrs: P9444 MW 11:00-12:00 Final Exam: Wed. April 21, 12:00 15:00 Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
6 Technical Details Grading Weekly Assign. = 15 % Midterm = 2x15% = 30% Tutorial Attendance = 5% Final = 50 % Resources Notes: Mastering Physics: Each other, TAs, me Other 1st-year texts: Tipler, Halliday-Resnick-Krane, other University Physics textbook. Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
7 Course Web Site: login using your SFU computing id and password Course materials including lecture notes, assignments, etc. all posted there Check your grades Can use the chat room to discuss with other students and send messages to other students (Warning: Instructors and TAs can see.) Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
8 Mastering Physics: We will use mastering physics for some assignment questions. You need the student access code which comes with your textbook (or you can buy one at the bookstore) You must register for the course: SFUPHYSICS121A You need your student ID and SFU postal code V5A 1S6 Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
9 Assignments, Midterms and Exams I really don t mind if you work together on assignments. In fact, I am quite lazy and would rather have you teach each other than do it myself. However, if you copy someone else s assignment it will not really be any benefit to you. You will see on the midterms and exam that it was not worthwhile. My advice: make sure you understand all of the assignment solutions every week. It is the only way to stay on top of things. Physics is doing. There is no 100% final exam option in this course. Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
10 Assignments, Midterms and Exams Dick and Jane have each run out of time to do assignment 4. Dick decides to copy solutions from some shady websites. Jane decides that she will do (and understand) as much of the assignment as she can and leave the rest blank. Dick gets 10/10 on the assignment and Jane gets 5/10. Who comes out ahead in the end? There are about 10 assignments in a term, each worth 1.5%. Therefore, Dick gains 0.75% on his final grade relative to Jane by copying. That assignment represents about 10% of the course material, so is 10% of the stuff on the final and 20% of the stuff on one of the midterms: % % = 8% Jane fully understands half of that material and so gets 4/8. Dick gets 0/8. Jane comes out ahead (3.25%). Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
11 Standard Calculators As you know, for midterms and exams you need to use a simple scientific calculator - Aurex SC6145 (or SC6108), available at the bookstore. Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
12 Course Content The Title of the course says it all: Optics, Electricity and Magnetism. In very broad strokes: Waves Optics Applied Optics (eg. lenses, gratings) Electricity (Coulumb s Law, Gauss Law) Applied Electricity (eg. circuits) Magnetism Applied Magnetism (eg. cyclotrons) Of course, there will be many other things learned along the way, but that is the gist... Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
13 Particles and Waves Physics - according to the dictionary Physics is the study of properties and interactions of matter and energy So far (in Physics 120) you have been learning to model nature based on particles. You know how to treat projectiles, billiard balls, etc. You have even taken those particles and allowed them to oscillate (SHM). This is one very useful way to look at things! Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
14 Particle Physics Particle Physics At the smallest distance scales, what is the world made of? How do those components interact? By convention there is color, By convention sweetness, By convention bitterness, But in reality there are atoms and space. -Democritus (c. 400 BCE) Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
15 Particle Physics On the way down in scale we have discovered hundreds of particles However, the fundamental ones are few... Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
16 Big Machines to see Small Things (when they work!) Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
17 Why we need big machines to see small things SLIDE STOLEN FROM P485 - INTRODUCTION TO ELEMENTARY PARTICLES We use particles as probes, remember what we learned from de Broglie ƛ = λ 2π = p Example Energy Wavelength visible light 0.4 ev m electron microsope 90 kev m X-rays (crystallography) kev m protons 100 MeV m photon 200 MeV m Hera (e-p collider) 314 GeV m Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
18 Particles, Waves and All That Particles have a Wavelength!!! Even particle physicists need waves. We need them because even particles sometimes look like waves... If you go on to second-year physics (eg. P285) you will see enough Quantum Mechanics to hear about wave-particle duality. It is even in Chapter 25 of your textbook...i hope we get to discuss it in a couple of weeks. Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
19 Now, back to the course...let s talk about light What is Light? This seems like a pretty basic question. Debated for centuries. First Greek scientists do not distinguish between light and vision. At some point we realize that light is a physical entity in its own right. It actually moves!! Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
20 What is Light? 1670s: Newton proposes a corpuscular model of light (opposed by Huygens and Hooke). 1801: Thomas Young experimentally establishes that light is a wave. 1817: Fresnel s experiments further confirm wave-nature of light. But what is waving? 1873: Maxwell establishes that light is an EM wave 1902: Lenard s experiments show the photoelectric effect 1905: Einstein proposes a photonic explanation for the photoelectric effect. 1927: Bohr proposes complementarity principle in QM. People are now really starting to believe Einstein. 2010: Students in Physics 121 are fascinated and confused by light. Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
21 Light is a wave AND a stream of particles Well, maybe light is a... Particle: a stream of photons moves from one point to another carrying information and energy. Wave: information and energy move from one point to another, but no material object makes the journey. An analogy - two ways to communicate: 1 Send a letter ( like a particle ) 2 Call on the telephone ( like a wave ) Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
22 Light is a wave AND a stream of particles Think of what happens in a camera: You build a lens to focus an image on a screen. We will learn about such lenses in this course, you will use them in P131. Here we see light acting as a wave. The light hits film or a sensor (digital camera) which records a hit from a photon - a particle Light is acting as one thing at a time...always either a particle or a wave, not both simultaneously. Is it both or neither?? We will see many examples of the wave-like behaviour of light in this course. The object in this course is not to understand what light is but to describe what light does. Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
23 The Speed of Light - Yes it moves The speed of light in a vacuum is c = m/s ( m/s exactly) Einstein tells us that nothing can travel faster than c. c is such a mind-boggling speed that it is difficult to perceive that light moves at all. Many brilliant experimentalists tried to measure the speed of light over the centuries. Galileo uncovering lamps on distant mountaintops If not instantaneous, it is extraordinarily rapid but Fizeau managed it in Douglas Adams Nothing travels faster than the speed of light with the possible exception of bad news, which obeys its own special laws. Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
24 The Speed of Light The speed of light is not always c. Outside a vacuum light travels at a speed less than c v = c n where n is the index of refraction and is always at least 1. Some examples medium n vacuum 1 (exact) air (at 0 C) water (at 20 C) 1.33 glass 1.5 Neil Alberding (SFU Physics) Physics 121: Optics, Electricity & Magnetism Spring / 1
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