Modern Physics

Physics 60, Fall 2009

Professor Jessica Kintner


Instructor's Information

  • Office: Gal 104
  • Phone: 925-631-4416
  • Email: jkintner@stmarys-ca.edu
  • Office Hours: TBA

Class Information

Announcements

  • 12/14 -- Grades are posted! See the link above.
  • 12/4 -- We will have a review session in Gal 208 on Sunday afternoon at 2:30.
  • 10/30 -- Someone left a textbook in the room (I'm guessing Arash or Gabby?) I'm putting it in Gal 206 (the room with the combo lock), so if you see this, you can get it.
  • 10/2 -- I will be available Sunday, October 4 from 3:30-5pm in Gal 104. Public Safety says they will open the building for us. If they don't, I'll open the door off the parking lot. Also, you should now be able to study as late as you like on the second floor of Galileo.
  • 9/28 -- EXAM 1 will be Monday, October 5
  • 9/18 -- There will be a BBQ for physics/3+2/math/CS majors Thursday, the 24th, at 5:30 on the patio in front of Brousseau Hall.
  • 9/4 -- I posted scores from in-class presentation of problems. Check these soon and let me know if you have any questions.
  • The textbook will be: Author(s): HARRIS
    Title: MODERN PHYSICS
    ISBN: 9780805303087
    Edition: 2ND 08
    Publisher: PEARSON
Date Section Topic Assignment
12/2 12.4 Cons of L no new problems! still outstanding: 12:24, 25, 11: 52, 10:49
11/30 12.3,4 Conservation Laws 33, 43, 34, 40, 35, 42, 47, 36, 38, 48, 37, 39, 41, 44, 45, 46; Also, 12: 24, 25, 11: 52, 57, 10:49 are still open.
11/23 12.3,4 Overview Fundamental particles and forces 12: 17, 18, 19, 23, 24, 25 26
11/20 11.6 Radioactivity and the Decay Law 11: 50, 51, 52, 54, 57
11/18 most of 10.6-7 Conduction Theory 10: 52, 53, 60, 63, 64
11/16 10.1, 5 Band Gap
Animation of Fig 10.1 , Fig 10.23
10: 25, 47, 48, 49, 50, 50b
11/13 parts of 7.5-6 Quantization of Angular Momentum 7: 37, 38, 41, 44, 45
11/11 all Exam 2 1, 2, 3, 4, 5a, 5b
11/9 4.3-5.11 Review
11/6 5.11 Well-defined Q States New 5: 68, 69, 70; Old 66b-d, 40, 62
11/4 5.11 Not Well-defined Energy States New 5: 30, 94, 95, 96, 97, 98; Old: 40, 62, 66
11/2 5.9 Non-stationary States New 5: 66a, 66b-d, Old: 40, L9, 56, 58, 61, 62
10/30 5.8 Expectation Values Ch5: New 55, 56, 57, 58, 59, 60, 61, 62, Old: 90, 40, 52, L9;
10/28 5.7 Simple Harmonic Oscillator 5: 50a, 52, 53, L9, 93,
10/26 5.6 Finite Well 5: 31, 33, 34, 40a, 40b, 40c
10/23 5.5,6 Pl in a Box, Finite Well L8, 5: 23, 24, 25, 27, 28
10/21 5.3,5 Normalization, Particle in a 1D Box 5: 78, 79, 80, 81, 90
10/19 5.1-2 The Schrodinger Equation Ray 2: 28, 29
10/16 4.6 The Bohr Model 4: 54, 55, 57
10/14 4.4 The HUP 4: 38, 40, 42, 43, 44
10/12 4.3 Free Particle SE 4: 33, 35, 36, 37a?, 37b
10/9 App K, 4.3 Complex Notation Problems: 1, 2, 3, 4, 5, 6, 7, 8
10/7 pre 4.3 Exam and Wave Equations L6a, L6b, L6c, and L7
10/2 0-4.2 Problems 2: 115b, 117, 3: 38, 4: 24, 25 are still missing!
9/30 3.5-6, 4.1-2 Pair Prod., Wave-Particle Duality 3: 40, 41, 42, 4: 15, 18, 19, 20, 24, 25
9/28 3.4 Problems 2: 115b, 117, 3: 25, 38 are still missing!
9/25 3.4 Compton Effect
PhET's PE Sim, Another PE Sim
3: 30, 31, 36, 38, 52, 53
9/23 3.1-2 Photoelectric Effect
3: 16, 17, 19, 20, 21, 25
9/21 3.1-2 Blackbody Radiation and Photoelectric Effect 2: 38a, 38b, 115a, 115b, 117, L3, L5, will be put on board or turned in Weds
9/18 2.8 Problems and examples L4a, L4b, L4c, , L5
9/16 2.10 Invariants 2: 97, 114, 115, 117, L3
9/14 2.7, 10 Collisions, Invariants 2: 83, 84, 86, 88, 92, 93ab, 93c
9/11 2.7 Relativistic p and E defined 2: 70, 71, 72, 73, 76ab, 76c, 77, 78
9/9 2.4,6 Velocity addition, Twin Paradox 2: 59, 60, 61, 63a, 63b, 46
9/4 2.3 Problems 2: 27, 33, 34, 37, 38, 41
9/2 2.2-4 The Postulates and their consequences 2: 20, 21, 25, 31, 44, L1, L2
8/31 2.1 Galilean Transforms, Inertial Ref frames

L1: Fill in the algebra (and be prepared to explain) the steps from Equation 2-4 through 2-12 in the text.

L2: Derive the unprimed lorentz Transformation Equations from the primed. (Go from equation 2-12 to 2-13 in the text.)

L3: Show that the space-time interval (c Delta_t)^2 - (Delta_x)^2 is invariant.

L4: On earth, an explosion happens at point A. 1microsecond later, there is a second explosion at point B. A and B are 600m apart. (a) A rocket ship buzzes by traveling at speed v relative to the earth. How fast is the rocket traveling if the two explosions happen at the same time in the rocket's frame? (b) How far apart are the events in the rocket's frame? (c) If A and B were 100m apart on earth, is there a frame where the two events are simultaneous? (d) Comment on your answer.

L5: Particle A hits particle B, which is at rest, producing particles C1, C2, C3,... Cn. Show the threshold energy for this reaction is: (M^2 - mA^2 - mB^2)c^2/(2mB) where M=mC1+mC2+...+mCn and mA is the mass of A and mB is the mass of B.

L6: Look up the derivation of the wave equation for a transverse wave on a string. Be prepared to explain it in class. (It would be great to work with someone else so you could split it up into parts and put it up on the board faster.) You can find this in most intro books--not the Knight, however. I also do not recommend the version on Wikipedia. A good outline of the derivation (might be enough for you to fill in the blanks) can be found here at the HyperPhysics site.

L7: Show that y(x,t) = A sin (kx-wt) is a solution to the wave equation above.

L8: We have said that d^2Psi/dx^2 = -k^2 Psi has solutions:
Psi = A sin kx + B cos kx
Psi = C sin (kx + delta)
Psi = D e^(ikx) + E e^(-ikx)
(a) Find C and delta in terms of A and B (b) Find D and E in terms of A and B. ( Here is a picture of the assignment from class.)

L9: Given that Psi1=Bxe^(-ax^2) where a=sqrt(mk)/(2hbar) is a solution to the Simple Harmonic Oscillator (a) Find B and (b) Find E, the total energy.


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