Oberlin College Physics 212, Fall 2013
Model Solutions to Assignment 1
Problem 1.5. Interval
2
(ct ) x
2
=
2
ct (V /c)x
1 (V /c)2
x (V /c)(ct)
2
1 (V /c)2
2
(ct (V /c)x) (x (V /c)(ct)2
1 (V /c)2
2
(ct) 2(V /c)x(ct) + (V /c)2 x2 ) (x2 2(V /c)x(ct) + (V /c)
Oberlin College Physics 212, Fall 2013
Model Solutions to Assignment 4
1. The metaphor is valid. Interference shows that light plus light can sum to darkness just as an
electric eld of 5 N/C west added to an electric eld of 5 N/C east sum to an electric e
Oberlin College Physics 212, Fall 2013
Model Solutions to First Sample Exam
Note the following problem solving techniques:
First step: draw a sketch.
Select a strategy the key idea to employ before rushing in to make detailed derivations.
When deriving
Oberlin College Physics 212, Fall 2013
Model Solutions to Assignment 2
Problem 4.3: Sticky particles and the classical limit
Initial: ball of mass m and speed v plus ball of mass m and speed 0.
Final: ball of mass M and speed V .
a. Classically conserve m
Intensity in Interference and Diraction
Intensity in Double-slit Interference. A wave of wavelength (wave number k = 2/, angular
frequency = kv) passes through two narrow slits located a distance d apart. The wave signal received at
a detector far from th
Solving the Schrdinger Time Development Equation
o
for the Innite Square Well
Dan Styer; c 5 November 2013
Setup. A single particle moves restricted to one dimension. In classical mechanics, the state of the particle
is given through position and velocity
What did we learn by solving
the Schrdinger time development equation
o
for the innite square well?
Dan Styer; c 8 November 2013
In one sense, we learned that the time development of a particle of mass m in an innite square well of
width L, with initial w
The Classical Limit of Quantum Mechanics
If the theory of quantum mechanics is correct, then when quantum mechanics is applied to big things, it
must give the results of classical mechanics.
Because quantum mechanics emphasizes potential energy V (x), and
Oberlin College Physics 212, Fall 2013
Assignment 3
Wednesday, 18 September
Take-home exam instead of problems this week. The exam will cover relativistic dynamics.
Reading: We move from relativistic dynamics to the next major topic of this course: classi
Oberlin College Physics 212, Fall 2013
Assignment 2
Wednesday, 11 September
Take-home exam instead of problems next week. The take-home exam will cover relativistic dynamics.
Reading: Continue reading about relativistic energy and momentum in the notes an
Oberlin College Physics 212, Fall 2013
Assignment 1
Wednesday, 4 September
In Physics 110 you learned about space and time in relativity. Now we turn to things like momentum
and energy in relativity.
Reading: My Notes on Relativistic Dynamics closely foll
Summary of quantum mechanics ideas
Spin
In general, a state | doesnt have a projection on the z axis. But the states |z+ and |z do have
such projections, and
the amplitude for | to have Lz = + /2 is z + |
h
the amplitude for | to have Lz = /2 is z | .
h
O