1. technology and computing

General Certificate of Education
June 2007
Advanced Level Examination
PHYSICS (SPECIFICATION A)
Unit 4 Waves, Fields and Nuclear Energy
PA04
Section A
Thursday 14 June 2007
9.00 am to 10.30 am
For this paper you must have:
! an objective test answer sheet
! a black ball-point pen
! a calculator
! a question paper/answer book for Section B
(enclosed).
Time allowed: The total time for Section A and Section B of this paper is 1 hour 30 minutes
Instructions
! Use a black ball-point pen. Do not use pencil.
! Answer all questions in this section.
! For each question there are four responses. When you have selected the response which you think is
the most appropriate answer to a question, mark this response on your answer sheet.
! Mark all responses as instructed on your answer sheet. If you wish to change your answer to a
question, follow the instructions on your answer sheet.
! Do all rough work in this book not on the answer sheet.
Information
! The maximum mark for this section is 30.
! All questions in Section A carry equal marks. No deductions will be made for incorrect answers.
! A Data Sheet is provided on pages 3 and 4. You may wish to detach this perforated sheet at the start
of the examination.
! The question paper/answer book for Section B is enclosed within this question paper.
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Data Sheet
!
!
!
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A perforated Data Sheet is provided as pages 3 and 4 of this
question paper.
This sheet may be useful for answering some of the questions in
the examination.
You may wish to detach this sheet before you begin work.
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SECTION A
In this section each item consists of a question or an incomplete statement followed by four
suggested answers or completions. You are to select the most appropriate answer in each case.
You are advised to spend approximately 30 minutes on this section.
1 The frequency of a body moving with simple harmonic motion is doubled. If the amplitude
remains the same, which one of the following is also doubled?
A
B
C
D
the time period
the total energy
the maximum velocity
the maximum acceleration
2 Which one of the graphs, A to D, best shows how the displacement, x, of a damped oscillator
that performs simple harmonic motion varies with time t?
x
0
x
1
2
3
t
4
0
1
2
A
t
4
B
x
0
3
x
1
2
3
C
4
t
0
1
2
3
4
t
D
Turn over!
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3 A wave motion has period T, frequency f, wavelength λ and speed c. Which one of the
following equations is incorrect?
A
c
T= λ
B
1 = Tf
C
c
λ= f
D
Tc = λ
4 In a transverse progressive wave of frequency 400 Hz, the least distance between two adjacent
points which have a phase difference of π rad is 0.40 m. What is the speed of the wave?
2
–1
A
160 m s
B
320 m s–1
C
640 m s–1
D
1280 m s–1
5 In order to produce interference effects with visible light, coherent sources must be used. The
waves produced by these sources do not need to have the same
A
B
C
D
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amplitude.
frequency.
wavelength.
photon energy.
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6 When a parallel beam of monochromatic light of wavelength λ is directed at two narrow slits,
S1 and S2, interference fringes are observed on a screen.
P
S1
incident
light
S2
screen
Which line, A to D, in the table gives the conditions for a dark fringe at point P on the screen?
(m in the table represents an integer.)
path difference
S2P – S1P
phase difference between
waves at P
A
mλ
0
B
(m + 2 )λ
180°
C
mλ
180°
D
(m + 2 )λ
1
1
0
7 Using a diffraction grating with light of wavelength 500 nm incident normally, a student found
the second order diffracted maxima in a direction at 30° to the central bright fringe. What is
the number of lines per metre on the grating?
A
2 × 104
B
2 × 105
C
4 × 105
D
5 × 105
Turn over!
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8 A capacitor of capacitance 2500 µF is charged by a constant current of 200 µA. What is the pd
across the capacitor 25 s after starting to charge?
A
B
C
D
0.50 V
1.0 V
2.0 V
4.0 V
V
9
1
C
S
2
R
Switch S in the circuit is held in position 1, so that the capacitor C becomes fully charged to a
pd V and stores energy E. The switch is then moved quickly to position 2, allowing C to
discharge through the fixed resistor R. It takes 36 ms for the pd across C to fall to V .
2
After the switch has been moved to position 2, how long does it take before the
energy stored by C has fallen to E ?
16
A
B
C
D
51 ms
72 ms
432 ms
576 ms
10 A small mass is situated at a point on a line joining two large masses m1 and m2 such that it
experiences no resultant gravitational force. If its distance from the centre of mass m1 is r1 and
its distance from the centre of mass m2 is r2 , what is the value of the ratio r1 ?
r2
A
m12
m22
B
m22
m12
C
m1
m2
D
m2
m1
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11 The Earth may be considered to be a uniform sphere of mass M and radius R. Which one of
the following equations correctly relates the gravitational constant, G, with the acceleration due
to gravity, g, at its surface?
A
G=
M
gR2
B
G=
gM
R2
C
G=
R2
gM
D
G=
gR2
M
12 What is the unit of gravitational potential?
A
J
B
J kg–1
C
m s–2
D
N kg–1
13 The magnetic flux through a coil of 5 turns changes uniformly from 15 × 10–3 Wb to
7.0 × 10–3 Wb in 0.50 s. What is the emf induced in the coil due to this change in flux?
A
B
C
D
14 mV
16 mV
30 mV
80 mV
Turn over!
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14
S P
S
N
N
copper
S
Q
R
N
lead
rubber
Three vertical tubes, made from copper, lead and rubber respectively, have identical
dimensions. Identical, strong, cylindrical magnets P, Q and R are released simultaneously
from the same distance above each tube. Because of electromagnetic effects, the magnets
emerge from the bottom of the tubes at different times.
Which line, A to D, in the table shows the correct order in which they will emerge?
resistivity of copper
resistivity of lead
resistivity of rubber
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= 1.7 × 10–8 Ω m
= 22 × 10–8 Ω m
= 50 × 1013 Ω m
emerges first
emerges second
emerges third
A
P
Q
R
B
R
P
Q
C
R
Q
P
D
P
R
Q
11
15
binding
energy per
nucleon
Q
R
P
0
A
0
The graph shows how the binding energy per nucleon of a nucleus varies with nucleon number, A.
Which one of the following statements is not true?
A
B
C
D
Energy is released in nuclear fission reactions from nuclei in region P.
Nuclei in region Q are more stable than nuclei in region R.
Nuclear fusion reactions bring nuclei closer to region Q.
The binding energy per nucleon increases most significantly at lower nucleon numbers.
END OF SECTION A
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