Download AS and A-level Physics Activity 3 Answers Preparing to teach

Activity 3: Answers
The following pairs of questions examine similar parts of the
specification. Which of the pair is the AS question and which is the Alevel question?
1. (a) Electron capture can be represented by the following equation.
𝑝 + 𝑒− → X + Y
Which row correctly identifies X and Y?
[1 mark]
X
Y
A
p
K−
B
e−
e+
C
n
νe
D
n
π0

AS, Paper 2, question 7
1. (b) The nucleus of 94 Be captures a proton and emits an α particle. What is the
product nucleus?
[1 mark]
A
10
6 C
B
7
3
C
6
3 Li
D
6
2
Li

He
A-level, Paper 1, question 7
1. (a)
1. (b)
AS?

A-level?

1
2. (a) In a photoelectric experiment, light is incident on the metal surface of a photocell.
Increasing the intensity of the illumination at the surface leads to an increase in the
[1 mark]
A
work function
B
minimum frequency at which electrons are emitted
C
current through the photocell
D
speed of the electrons

A-level, Paper 1, question 14
2. (b) The intensity of a monochromatic light source is increased. Which of the
following is correct?
[1 mark]
A
B
C
D
Energy of an emitted
photon
increases
increases
unchanged
unchanged
Number of photons
emitted per second
increases
unchanged
increases
unchanged

AS, Paper 2, question 10
AS?
2. (a)
2. (b)
A-level?


2
3. (a) Monochromatic light may be characterised by its speed, frequency and
wavelength. Which of the following quantities change when monochromatic light
passes from air into glass?
[1 mark]
A
B
Speed only.
Speed and wavelength only.
C
Speed and frequency only.
D
Wavelength and frequency only.

A-level, Paper 1, question 13
3. (b) Sound waves cross a boundary between two media X and Y. The frequency of
−1
the waves in X is 400 Hz. The speed of the waves in X is 330 m s and the speed
of the waves in Y is 1320 m s–1. What are the correct frequency and wavelength in
Y?
[1 mark]
A
Frequency / Hz
100
Wavelength / m
0.82
B
400
0.82
C
400
3.3
D
1600
3.3

AS, Paper 2, question 17
AS?
3. (a)
3. (b)
A-level?


3
4. (a) Three identical cells, each of internal resistance R, are connected in series with
an external resistor of resistance R. The current in the external resistor is I. If one of
the cells is reversed in the circuit, what is the new current in the external resistor?
[1 mark]
A
B
C
D
𝐼
3

4𝐼
9
𝐼
2
2𝐼
3
AS, Paper 2, question 29
4. (b) In the circuit shown, V is a voltmeter with a very high resistance. The internal
resistance of the cell, r, is equal to the external resistance in the circuit.
Which of the following is not equal to the emf of the cell?
[1 mark]
A the reading of the voltmeter when the Switch S is open
B the chemical energy changed to electrical energy when unit
charge passes through the cell
C twice the reading of the voltmeter when the switch S is closed
D the electrical energy produced when unit current passes
through the cell

4
A-level, Paper 1, question 16
AS?

4. (a)
4. (b)
A-level?

5. (a) An object falls freely from rest. After falling a distance d its velocity is v. What is
its velocity after it has fallen a distance 2d?
[1 mark]
A
2v
B
4v
C
2v
D
2v
2

A-level, Paper 1, question 25
5. (b) An object is dropped from a cliff. How far does the object fall in the third second?
Assume that g = 10 m s−2.
[1 mark]
A
10 m
B
C
20 m
25 m
D
45 m

AS, Paper 2, question 20
AS?
5. (a)
5. (b)
A-level?


5