ENPH/PHYS 242 Fall 2013
Problem Set 1 - Solution
1. Spacetime Diagram [a) 4; b) 1; c) 2]
Anna and Ben are standing 5.0 m apart when Ben pulls a paint filled balloon out of his pocket.
Anna sees this a
ENPH/PHYS 242 Fall 2013
Name:
Student Number:
Quiz 3 - Solution
Monday November 04, 15:30 pm
[If you feel information is missing anywhere: make a reasonable assumption and clearly state what your
assu
ENPH/PHYS 242 Fall 2013
Quiz 2 - Solution
Monday October 21, 15:30 pm
Question 1: [3 points]
An astronomical object emits light of a known frequency. We observe this object and measure a
frequency tha
ENPH/PHYS 242 Fall 2013
Quiz 1 - Solution
Monday September 23, 15:30 am
Question 1: [2.5 for each correct answer; -2 for each wrong answer; minimum 0]
Which of the following comments about the ether h
ENPH/PHYS 242 Fall 2013
Problem Set 5 - Solution
Due Monday October 21, 15:30 pm
1. Relativistic energy [a) 2; b) 2; c) 1; d) 1; e) 1]
In 1987 a supernova (exploding star) was discovered in the Large
ENPH/PHYS 242 Fall 2013
Problem Set 2 - Solution
1. Binary Stars [a) 1; b) 1; c) 2]
A binary star system has a distance from Earth of 42.2 light years. The distance between the stars
is 1.08 1011 m an
ENPH/PHYS 242 Fall 2013
Name:
Student Number:
Quiz 3 - Solution
Wednesday November 05, 13:30 pm
[If you feel information is missing anywhere: make a reasonable assumption and clearly state what your
a
ENPH/PHYS 242 Fall 2016
Homework Assignment #7 - Solution
1. Thermal excitation in a gravitational system [ a) 1p; b) 2p; c) 1p; d) 2p ]
A crazy physicist installs a cylindrical tube in the CN tower,
ENPH/PHYS 242 Fall 2016
Homework Assignment #4 - Solution
Relatively Pretty Fireworks [a) 4; b) 2; c) 3; d) 2]
It was both Newtons and Einsteins hobby to develop sophisticated fireworks. One of Newton
ENPH/PHYS 242 Fall 2014
Quiz 4 - Solution
Wednesday November 19, 13:30 pm
Question 1: [4]
A silicon crystal with a lattice spacing of 0.54 nm is exposed to characteristic x-rays of copper
with an ener
ENPH/PHYS 242 Fall 2016
Homework Assignment #3 - Solution
Space-mail [a) 1; b) 2; c) 2; d) 3; e) 2; BONUS: 2]
Albert owns a comfortably large spaceship with a proper length
= 99 m. He is planning on
v
ENPH/PHYS 242 Fall 2014
Quiz 2 - Solution
Wednesday October 15, 13:30 pm
Question 1: [4 points]
A red LED emits light with a wavelength of 682 nm in all directions. It moves with a high speed relative
ENPH/PHYS 242
Fall 2013
Quiz 4
Quiz 4 - Solution
Monday November 25, 15:30 pm
Question 1: [2]
The life time of the first excited state of hydrogen is
1.6
minimum uncertainty in energy (in units of V)
ENPH/PHYS 242 Fall 2016
Homework Assignment #8 - Solution
Thermal Radiation [ a) 1p; b) 1p; c) 4p; d) 4p ]
The emission of an incandescent light bulb is well described by a black body spectrum.
a) The
ENPH/PHYS 242 Fall 2016
Homework Assignment #1 - Solution
Particles and Waves [a) 1; b) 2; c) 4; d) 1; e) 2]
Three friends go out on a lake with a paddle boat. The boat is moving with = 2.0 m/s on the
ENPH/PHYS 242 Fall 2016
Homework Assignment #5 - Solution
Trouble with Space Traffic [a) 4; b) 2; c) 1; d) 1; e) 2]
Albert travels in his spaceship to Spaceton (formerly also known as Space Town). As
ENPH/PHYS 242 Fall 2016
Homework Assignment #10 - Solution
2. Bragg Reflection [a) 2; b) 3]
Bragg reflection is used to analyse the composition of the radiation form an x-ray tube. The
analysing cryst
ENPH/PHYS 242 Fall 2016
Homework Assignment #9 - Solution
1. Photoelectric Effect [a) 1; b) 1; c) 3]
We have a light source with adjustable wavelength but fixed power ( = 23.8 mW). The light is
emitte
ENPH/PHYS 242 Fall 2014
Quiz 1 - Solution
Wednesday September 24, 13:30 pm
Question 1: [5 points]
The train paradox describes a situation where light is emitted in the centre of a train. Within the
re
QUEENS UNIVERSITY PHYS 242 TEST
QUEENS UNIVERSITY PHYS 242 TEST
QUEENS UNIVERSITY PHYS 242 TEST
QUEENS UNIVERSITY PHYS 242 TEST
QUEENS UNIVERSITY PHYS 242 TEST
QUEENS UNIVERSITY PHYS 242 TEST
QUEENS U
QUEENS UNIVERSITY PHYS 242 TEST
QUEENS UNIVERSITY PHYS 242 TEST
QUEENS UNIVERSITY PHYS 242 TEST
QUEENS UNIVERSITY PHYS 242 TEST
QUEENS UNIVERSITY PHYS 242 TEST
QUEENS UNIVERSITY PHYS 242 TEST
QUEENS U
ENPH/PHYS 242 Fall 2013
Tutorial Week 11
Monday November 25, 15:30 pm
Cross section of a Photon
We consider hydrogen gas in thermal equilibrium at
6000 K . The life-time
of the first excited state of
ENPH/PHYS 242 Fall 2013
Tutorial Week 1 - Solution
Monday September 16, 15:30 pm
a) Galilean for the addition of velocities
law
vc= vc' +V vc' = vc V = 3 m/s 1 m/s = 2 m/s
V
S
S'
Student
d)
b) Since t
ENPH/PHYS 242 Fall 2013
Problem Set 3 - Solution
Due Monday October 07, 15:30 pm
Lorentz Transformation
A particle is produced in a very energetic reaction (event ). It moves away from the location of
ENPH/PHYS 242 Fall 2013
Problem Set 4 - Solution
Due Tuesday October 15, 15:30 pm
Velocity addition [ a) 4.5p; b) 5.5p ]
240 km/h. A relatively
A relatively low speed train with a length of
100 m trav
39
ENPH/PHYS 242 Fall 2014
L 13
Cosmic Microwave Background
Shortly after the Big Bang the Universe was very dense and hot. Since
then it has expanded and cooled down. However, we still can measure
th
48
ENPH/PHYS 242 Fall 2014
L 16
1.3.7 Relativistic Dynamics
The basic equation for classical dynamics is Newtons second law:
In special relativity we use the same relation between force and
moment
13
ENPH/PHYS 242 Fall 2013
L 04
1.2 Speed of Light
1.2.1 Historical Introduction
To our everyday experience light seems to arrive from its source
instantaneously. For a long time in history most peopl