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 energy of 8.9 k V.
a) What is the smallest angle (in degree
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
to an observer who sees the light being green at 551 n
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
assumption is]
Question 1: [4 points]
Assume you observe
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
reference frame of the train the light should arrive at t
ENPH/PHYS 242 Fall 2014
Tutorial Week 2
Wednesday September 17, 13:30 pm
1. Spacetime Diagrams
a) A visit to the zoo
A lion in a cage moves with constant velocity back and forth, turning around when he
reaches the ends of his cage. A boy and a girl get to
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ENPH/PHYS 242 Fall 2014
L 10
1.3.4 Velocity Transformation, Four-Velocity
After we have derived the relativistically correct transformation law
for the space and time coordinates we go to the next step and discuss
the velocity transformation. This mean
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ENPH/PHYS 242 Fall 2013
L 07
Cosmic Ray Muons and Length Contraction
For a change we now will discuss a real experiment as performed by
Frisch and Smith, two US American physicists in 1963. This
experiment is concerned with the measurement of cosmic ra
ENPH/PHYS 242 Fall 2014
Relativity and Quanta
Lecture Notes
Wolfgang Rau
Queens University
ENPH/PHYS 242 Fall 2014
1
ENPH/PHYS 242 Fall 2014
L 01
Introduction
At the end of the 19th century many physicists believed that the basic
problems of physics had b
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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 people believed that
this is actually true. The first docume
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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
momentum:
We can calculate the derivative of
explicitly a
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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
the thermal radiation from the Big Bang which today has a
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 and runs away at 7.5 m/s. A second (1.0 s) later Ben thr
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 that is only half of the emission frequency.
a) Is this ob
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 travels at
slow conductor moves through the train from fron
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
its production (the production target) at high speed.
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 and the rotation period is 104 days. Assume equal masses
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 the is reflected without energy loss, the
speed before a