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Answers to PC1144 0304 Paper
Part I
1
04
.
3
t
years
No. In the passenger’s frame the distance between Earth and X has contracted,
while to a stationary observer on Earth (or X), the time in the spaceship has
dilated.
2(a)
c
v
994
.
0
2(b)
c
v
2(c)
c
v
194
.
0
2(d)
c
v
3
Hint: Substitute the solution into Schrodinger’s equation
4
3
10
0
.
2
t
years
5(i)
Conservation of lepton number is violated.
5(ii)
Conservation of charge is violated.
5(iii)
Conservation of baryon number is violated.
5(iv)
Conservation of baryon number is violated.
5(v)
Conservation of charge is violated.
Part II
6(a)
The total energy of a system is the sum of its kinetic energy, a result of its motion
with respect to an observer, and its rest mass energy, which is the energy due to
its mass according to equation
2
mc
E
6(b)
Use the hint
6(c)
Massless particle travel at the speed of light. Therefore, as
0
m
,
,
m
is
not zero or infinity for a massless particle, so
mv
p
is still valid.
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This note was uploaded on 01/14/2011 for the course PHYS 1144 taught by Professor Li during the Spring '10 term at National University of Singapore.
 Spring '10
 LI

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