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Answers to PC1144 0203 Paper
1(a)(i)
Hint: Use inverse Lorentz transformation equation
1(a)(ii)
Hint: Use Lorentz transformation equation
1(b)
s
t
17
1(c)
Excess = 19 m
2(a)
Total energy is the sum of the kinetic energy and rest mass energy
2(b)
c
v
901
.
0
2(c)
1
3
10
35
.
9
ms
v
3(a)
Refer textbook/notes for details.
3(b)
Hint: Use KE = electric PE, then make substitution to
2
v
in
n
mvr
n
3(c)
Simple substitution will do
3(d)
Use Balmer series,
3
n
4(a)
L
A
2
4(b)(i)
National University of Singapore
Physics Society 2009
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View Full Document4(b)(ii)
4(c)
Refer textbook/notes for details
4(d)
The energy for harmonic oscillator is
hf
n
E
n
2
1
, when a particle deexcites from
one energy level to another, the photon has energy of integral multiple of
hf
, which is
in agreement with the blackbody radiation.
5(a)
Binding energy is the difference in energy between the total rest mass energy of the
nucleus and the sum of the rest mass of the constituents.
5(b)
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 Spring '10
 LI
 Energy, Kinetic Energy, Mass

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