Physics 251, Fall 2014, Midterm#1, Oct. 2, 2014 Version A
1. (20 pts) Here is an image of a rail-road tunnel through a mountain, and past some trees,
as seen in its rest frame. There is also an image of a t
PHY251 Homework Set 2
Reading : Chapter 2, 3 Homework:
{ {
Chapter 2, Questions 6, Problems 2, 4, 7, 8 Chapter 3, Questions 7, Problems 3, 4, 34
Question II.6 You have been given a superwatch accurate to a nanosecond. You want to set the watch so t
phy251_hw10
PHY251 Homework Set 10
Reading: Chapter 11, 12 Homework: Chapter 11, Question 1, Problems 2,5,11,14 Chapter 12, Problems 7,23,31
Hints and Solutions
Question XI.1 (10 points) One of the great puzzles in heredity before the quantum theor
PHY251_M2_S01_solutions
Name:
PHYSICS 251 - Final Exam
Wednesday, May 16, 2001
Show all work for full credit! I. Short answer problems (120 points)
1. Calculate the momentum p and the wavelength l of: (Use eV/c and nm units!) i. a photon of 10 e
average
8.3
An "eigenfunction of energy" solves
H psi = E psi. The two parts have
different E's so the sum doesn't solve it.
Both parts are eigenstates of Lz with
eigenvalue 0, so the sum is an
eigenfunction of Lz.
psi(x,0,0) vs x;
psi(0,0,z) vs z
Almost
Physics 251, Fall2AL4, Midterm#2, Nov. 6,2014 Name:
Version A - [t's a good idea to write your name on each page. It should agree with the
sticker on the back.)
only. Show or,explain how you
solve problems, unless that is evidently unnecessary. All answer
Physics 251, Fall2OL4, Midterm#Z, Nov. 6,2014 Name:
Version B - (lt's a good idea to write your name on each page. It should agree with the
sticker on the back.)
Closed book, no notes, simple scientific calculators only. Show or explain how you
solve prob
Physics 251, Lecture 11, Tuesday Oct. 7, 2014 P. B. Allen, Stony Brook University
Midterm exam #1 will be
returned during recitation,
and discussed in recitation.
Grades and answers are posted
on blackboard.
HW read Eisberg & Resnick Ch. 2
HW#5 due in cla
Physics 251, Fall 2014, Midterm#1, Oct. 2, 2014 Version B
1. (20 pts) Here is an image of a rail-road tunnel through a mountain, and past some trees,
as seen in its rest frame. There is also an image of a t
PART B -
Problem Grade
Physics 251 Fall 2014 Final Exam
Name:
3. [25 pt] A hydrogen atom is excited into its 313 state, and decays back to its 23 state.
a. [6pt] What is the energy in eV 0f the photon emitted?
b. (6th What is its wavelength in mm?
c.
Modern Physics, Physics 251
and 252
Fall 2014
Department of Physics and
Astronomy, Stony Brook
University
This is a photo from the First
Solvay Conference (Brussels,
1911). Modern physics was
about to begin.
Lectures (Javits 103; Tu-Th 1-2:20 pm)
Prof. Ph
Physics 251 Fall 2014
Thermal radiation a summary of Ch. 1 of Eisberg and Resnick. Please read the Chapter
carefully. These notes are intended as a guide.
8 2
Eq. (1-12) N( ) = 3 = number of normal modes,
Here are 5 formulas for energy. All are correct. All are inconsistent with the others.
formula
full name
1.
KE(non-rel)
good when
v<c, or
equivalently
p2/2m<mc2
E(massless), or
used when
E(extreme relativis
Modern Physics (PHY 251)
Lecture 22 (11/18/2014)
Laszlo Mihaly (based on notes by Joanna Kiryluk)
Fall Semester Lectures 2014
Department of Physics and Astronomy, Stony Brook University
! Time dependent Schroedinger equation
wave-pocket scattering
! The
Physics 251, Lecture 26 (the Last!)
Thursday Dec. 4, 2014
P. B. Allen, Stony Brook University
HW read E&R Ch.15 secs. 1-4
and Ch.16 secs. 1-3, 9
HW#10 due in class today
Final exam Monday Dec. 15, 5:30-8 pm
Place: Benedict Hall
Final exam location
Benedic
Modern Physics (PHY 251)
Lecture 20 (11/13/2014)
Laszlo Mihaly (based on Joanna Kiryluks notes)
Fall Semester Lectures 2014
Department of Physics and Astronomy, Stony Brook University
Time independent Schroedinger equation
Solutions: free electron
Solu
Physics 251, Lecture 10, Tuesday Sept. 30, 2014 P. B. Allen, Stony Brook University
Lab report #3 due in Lecture today
HW #4 due in Lecture today. Answers posted later today.
Midterm 1 in Lecture Thursday this week Oct. 2
Two Question sessions
1 Tomorrow
Physics 251, Lecture 9, Thursday Sept. 25, 2014 P. B. Allen, Stony Brook University
HW #3 due in Lecture today. Answers posted by Friday.
Midterm 1 in Lecture Thursday next week Oct. 2
HW #4 (short) due in Lecture Tuesday next week (Sept. 30)
Answers to H
Physics 251, Lecture 8, Tuesday Sept. 23, 2014 P. B. Allen, Stony Brook University
HW #3 due in Lecture Thursday this week. Answers posted by Friday.
Midterm 1 in Lecture Thursday next week Oct. 2
HW #4 (short) due in Lecture Tuesday next week (Sept. 30)
Physics 251, Lecture 12, Thursday Oct. 9, 2014 P. B. Allen, Stony Brook University
New J. Phys. 7 (2005) 97
HW read Eisberg & Resnick Ch. 2
Photoemission spectroscopy - from early HW#5 due in class Thursday Oct. 16
days to recent applications
(posted on B
Physics 251, Lecture 15,
Tuesday Oct. 21, 2014
P. B. Allen, Stony Brook University
Lab reports due now (here!)
HW#6 due Thursday this week.
HW#7 due Thursday next week.
(to be posted later today on Blackboard)
Midterm exam #2 Thursday Nov. 6
Bohr finished
Physics 251, Lecture 13, Tuesday Oct. 14, 2014 P. B. Allen, Stony Brook University
HW read Eisberg & Resnick Ch. 3
HW#5 due in class Thursday Oct. 16
HW#6 due in class Thursday Oct. 23
(posted on Blackboard).
The curve of binding energy.
One message: neut
Physics 251, Lecture 16,
Thursday Oct. 23, 2014
P. B. Allen, Stony Brook University
En = -ke2/n2aB = -13.6 eV/n2
2
1
9 Nm
= 9 10
Lazy notation I will use from now on: k
4 0
C2
Lab #6 Monday Oct. 27
HW#6 due Today.
HW#7 due Thursday next week.
(posted on
Physics 251, Lecture 14, Thursday Oct. 16, 2014 P. B. Allen, Stony Brook University
HW read Eisberg & Resnick Ch. 3
start Ch 4
HW#6 due in class Thursday Oct. 23
(posted on Blackboard).
The number -1 is
a. A mathematical construct for solving x+1=0
b. A s
Physics 251, Lecture 20,
Tuesday Nov. 11, 2014
P. B. Allen, Stony Brook University
HW#8 due Thursday Nov. 13
Which of these is a true identity?
a.
b.
c.
d.
eab = ea eb
ea-b = ea/b
ea+b = ea eb
ea+b = ea + eb
Exactly solvable 1d
problems time-independent
S
Physics 251, Lecture 19,
Tuesday Nov. 4, 2014
P. B. Allen, Stony Brook University
Lab 6 report due in class Today
Midterm exam #2 Thursday
Q&A sessions tomorrow
(Wednesday Nov. 5)
4 pm and 5 pm
room Physics B-131
More jargon of quantum mechanics. Notation
Modern Physics (PHY 251)
Lecture 24 (12/02/2012)
Laszlo Mihaly (based on notes by Joanna Kiryluk)
Fall Semester Lectures 2014
Department of Physics and Astronomy, Stony Brook University
! Hydrogen-like Ions in Quantum Mechanics
o Electron states, Quantum