2130 HW 1
Due: Fri 1/24 noon. Turn it by putting it in the box labeled 2130 at the entrance to the helproom
(G2B90).
1. A big cannon shoots cannonballs the size of watermelons with an initial velocity of 132
Physics 2130, HW 11
Due Mon. Apr. 21
1) An electron has a total energy as shown by the blue dashed line and a potential energy curve as shown by the
red line.
a) In which regions (1-8), would you expect the solutions to the Schrodinger equation, (x), to b
Phys. 2130 HW02
Due: Friday 1/31 noon. Turn it by putting it in the box labeled 2130 at the entrance to
the helproom (G2B90).
1. (5pts. For both correct answers, otherwise 0pts.) Einsteins relativity
principles:
Due Wed. Oct. 12, 2016
Homework Assignment 7 Solutions
Due Wednesday Oct. 12, 2016, 5PM
Problem 1) (5 pts) Select one long answer problem from HWK 5, for which you had the
wrong answer. Then:
i) identify the question number you are correcting
ii) state (c
Announcements
Todays class
Reading for Wednesday: finish chapter 1,
(1.14).
A little more on evidence
for time dilation.
Length contraction
Lorentz transformation
HW3 assigned today due Wednesday noon.
CULearn website is up. Homework solutions
will
Today: Review of SR
Exam1: Tomorrow, 7:30-9:00pm, DUANE G1B20
IN THIS ROOM! (unless I emailed you
otherwise)
You can bring 1 paper (Letter format) written on one
side with whatever you think might help you during
the exam. But you cannot bring the textboo
Announcements
Reading for Review chapters 1 and 2
A proton (mass 1.6e-27 kg) is travelling at 0.99 c. How
much Kinetic energy does it have?
HW 4 Due Wed. noon. Some of the topics on
this will be on the exam! Dont be late.
K = (-1)mc2
a) 6e-11 Joules
Fi
Announcements
Proper time.
An object is moving past you with a relative velocity
u=0.8c (as measured by you). When your watch shows
1 second has elapsed how much time does a clock held
by an observer in the objects rest frame show has
elapsed?
a) 0.6 s
b)
Todays class
Announcements
Length contraction
Lorentz transformation
Doppler shift
Reading for Monday: 2.1 - 2.5
HW 3 is posted. Due next Wed. noon.
The Lorentz transformation
Lorentz transformation
(Relativistic version of Galileo transformation)
y
Phys 2130, HW 10 Due Fri Apr. 11
1. 5 pts. What is the smallest possible energy (in femto-eV (10-15) the ground state for an electron
in a 0.001 m (1 mm) wire? You may assume the wire acts as an infinite square well.
_
For the next 9 questions, consider t
PHYS 2130, HW6. Due date: Fri, Feb. 28 at noon in G2B90.
1. You illuminate a metal plate with light, which has the wavelength of 300nm. The ejected
photoelectrons have the velocity of 0.002c. a) 5pts. What is this
Phys 2130 HW 8 Due Fri Mar. 21
1. (5 points) Describe the limitations of the Bohr model. Which of these limitations does
the deBroglie wave model address and why?
2. (5 points) Suppose you have an electron with a kinetic energy of 4.5eV and a photon
with
Phys. 2130 HW04
Problems 1-4 are relevant for the exam. They are due: Wed. 2/12 noon. Turn it by putting it in the
box labeled 2130 at the entrance to the helproom (G2B90).
Problems 5-10 due Wed. 2/19 noon (
Phys 2130 HW 9 Due Fri. Apr. 4
1.a. 5 pts. Weve been using a bunch of new terms and symbols, including:
1.
2.
3.
4.
5.
,
|2,
*,
the wave function, and
the probability density.
Explain the relationship between these terms and symbols. Which could you infer
Announcements:
Reading for Friday: 6.1 6.3 Exam 2 is next week (Tue. March 9th, 7:309:15pm). Topics: TZD, Chapters 1-5, 11.9, 11.10 11.10 Office hours: Today 1 3pm
Today: LASERs!
Q1
Whats so special about LASER light?
A) It doesn't diffract when it goes t
Announcements:
Reading for Wednesday: 11.9 & 11.10 Exam 2 is next week (Tue. March 9th, 7:309:15pm) Topics: TZD, Chapters 1-5, 11.9, 11.10 Practice exam is posted on CUlearn. (Disclaimer: The exam next week will not be the same as the one posted.)
Energy
An single electron bashes into an atom in a discharge lamp
- 10 V + -2 eV -3 eV -6 eV -10eV If atom fixed at this point in tube, list all the possible photon energies (colors) that you might see? A. 1eV, 2eV, 3eV, 4eV, 7eV, 8eV B. 4eV, 7eV, 8eV C. 1eV, 3e
Today (and next class):
Announcements
Light is a wave! Or is it? (also some E&M refresher)
Reading for Monday: 4.3 4.4
HW5 Assigned Wednesday.
Participation scores up today
Still updating CULearn.
Midterm average 77 14
How do you generate light (elec
Electromagnetic waves carry energy
Emax
Electromagnetic waves carry energy
Emax=peak amplitude
X #1
c
Emax
X
X #2
E1max=E2max>E3max
f1 = f3 < f2
X #3
Which barrel will heat up the fastest?
a. 2>1>3
b. 1>2>3
c. 1=2>3
2
d. 1=3>2
e. 2>1=3 Intensity = power/a
Due Wed. Sept. 14, 2016
Homework Assignment 3 Solutions
The problems this week cover topics in time dilation, length contraction, and Lorentz
Transformations. Each TZ&D problem is worth 10 points. The Causality problem is
worth 20 points.
I encourage you
Physics 2130 NAME: go /
Student ID #
Exam 1: one 8.5x11" cheat sheet, and calculator.
Test time: 60 minutes
EXAM VERSION: A
Please do not open the exam until asked to do so.
0 Your exam should have 8 pages, numbered Exam 1.1 thru Exam 1.8.
o This exam c
Due Wed. Sept. 28, 2016
Homework Assignment 5 Solutions
We are beginning to move from Special Relativity towards quantum mechanics. In this
problem set we consider some of the implications of mass and energy and then move on
to understanding EM waves. The
Due Wed. Oct. 5, 2016
Homework Assignment 6 Solutions
This problem set is about electromagnetic waves, about complex numbers and functions
of complex numbers, and about the photoelectric effect, where the discrete nature of
electromagnetic radiation appea
Due Wed. Sept. 21, 2016
Homework Assignment 4 Solutions
This assignment concentrates on the Lorentz transformations and the new definitions of
momentum and energy, definitions that are chosen to match the observation that
momentum and energy are conserved
Due Wed. Aug. 31, 2016
Homework Assignment 1 Solutions
Each Problem will be worth 10 points for a total problem set of 50 points.
Problem 1.
TZ&D 1.6
Most of you understood the idea of the two different reference frames. The first is a small
mass approach
Due Wed. Oct. 26, 2016
Homework Assignment 9
Due Wednesday Oct. 26, 2016, 5PM
Problem 1) (5 pts) You know the routine! Select one of the problems from HWK 7 that
you either got wrong, or which really caused you to think. Then:
i) identify the question
ii)
Due Wed. Oct. 19, 2016
Homework Assignment 8
Due Wednesday Oct. 19, 2016, 5PM
Problem 1) (5 pts) Select one of the Lectures from Week 7, and find an in-class question
that you either got wrong, or which really caused you to think. Then:
i) identify the qu
HWK 2 Solutions
Due Wed. Sept. 7, 2016
Homework Assignment 2 Solutions
This problem set is mostly about how the time between events can be measured to be
different in different inertial frames. We refer to the effect as Time Dilation. The last
problem inv
Announcements
You just woke up inside a boat with no windows.
The boat is on the surface of a perfectly still lake.
How can you determine if the boat is moving at a
constant speed or if it is standing still relative to
the shore?
Reading for Friday: TZD