PHYSICS A-level Paper 1, Quizzes of Physics

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AQA A Level Physics Paper 1 2020 Question Paper

PHYSICS A-level

Paper 1

Monday 18 May 2020 Afternoon Time allowed: 2 hours

Materials

For this paper you must have:

 a pencil and a ruler

 a scientific calculator

 a Data and Formulae Booklet.

Instructions

 Use black ink or black ball-point pen.

 Fill in the boxes at the top of this page.

For Examiner’s Use

Questio

n

Mark

1

2

3

4

5

6–

TOTAL

AQA A Level Physics Paper 1 2020 Question Paper

 Answer all questions.

 You must answer the questions in the spaces provided. Do

not write outside the box around each page or on blank

pages.

 If you need extra space for your answer(s), use the lined pages at

the end of this book. Write the question number against your

answer(s).

 Do all rough work in this book. Cross through any work you do

not want to be marked.

 Show all your working.

Information

 The marks for questions are shown in brackets.

 The maximum mark for this paper is 85.

 You are expected to use a scientific calculator where appropriate.

 A Data and Formulae Booklet is provided as a loose insert.

JUN20740101

IB/M/Jun20/E

7408/

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Section A

Answer all questions in this

section.

box

.

Determine whether the following reaction is a possible decay for the neutral pion π

0

.

π

0

→ e

−

+ μ

+ v

e

[2 marks]

.

State the two possible quark configurations

of a π

0

.

[1 mark]

.

A student suggests that the kaon K

0

and the anti-kaon

�

K

�

0

are the same particle.

Discuss whether this suggestion is correct.

[2 marks]

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The nucleus is held together by a force. It was predicted that a particle

exists that is responsible for this force. The particle itself must

experience this force.

The particle would have a rest energy between that of an electron and

half that of a nucleon.

Discuss whether a kaon, a muon and a pion each have the properties of the

predicted particle.

box

Information about these three particles is in the Data and

Formulae Booklet.

[4 marks]

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0 2 Figure 1 shows an arrangement used to investigate the photoelectric effect.

Figure 1

A current is measured on the microammeter only when electromagnetic

radiation with a frequency greater than a certain value is incident on the

photoemissive surface.

Explain why the frequency of the electromagnetic radiation must be

greater than a certain value.

[2 marks]

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The apparatus in Figure 1 is used with a monochromatic light source of

constant intensity. Measurements are made to investigate how the current

I in the microammeter varies with positive and negative values of the

potential difference V of the variable voltage supply.

Figure 2 shows how the results of the investigation can be used to find

the stopping potential.

Figure 2

.

Determine the number of photoelectrons per second leaving the

photoemissive surface when the current is a maximum.

[2 marks]

number of photoelectrons per second =

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.

Explain why I reaches a constant value for positive

values of V.

[2 marks]

box

.

Explain why I decreases as the value of V becomes more negative.

[3 marks]

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.

The investigation is repeated with a different photoemissive surface that

has a smaller value of the work function. The source of electromagnetic

radiation is unchanged.

Discuss the effect that this change in surface has on the value of

the stopping potential.

box

[3 marks]

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07

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0

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0 

box

A student investigates the interference of sound waves using two

loudspeakers,

P and Q , connected to a signal generator (oscillator). Each loudspeaker

acts as a point source of sound.

Figure 3 shows the arrangement.

Figure 3

Point O is the midpoint between P and Q.

Explain why the two loudspeakers are coherent sources of sound waves.

[2 marks]

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The student faces the two loudspeakers at point A. Point A is at equal

distances from

P and Q.

He then moves to point B , at right angles to the line OA , still facing the two

loudspeakers.

As his head moves from A to B the amplitude of the sound wave he hears

decreases and then increases. The amplitude starts to decrease again as

he moves beyond B.

box

Explain why the variation in amplitude occurs as he moves from A to B.

[3 marks]

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• 13 *

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.

The student records the following data:

separation of the two loudspeakers = 0.30 m

distance OA = 2.25 m

distance from A to B = 0.95 m

Show that the path difference for the sound waves from the two

loudspeakers to point B is about 0.1 m.

box

[3 marks]

.

The frequency of the sound wave is 2960 Hz.

Calculate the speed of sound from the student’s data.

[1 mark]

speed of sound =

m s

−

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box

.

The student moves his head to point C as shown in Figure 4. The emitted

frequency of the sound from the loudspeakers is then gradually decreased.

Figure 4

Discuss the effect that this decrease in frequency has on the amplitude of

the sound wave heard by the student.

[3 marks]

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There are no questions printed on this page

DO NOT WRITE ON THIS PAGE

ANSWER IN THE SPACES PROVIDED

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A pair of cameras is used on a motorway to help determine the average speed of

vehicles travelling between the two cameras.

Figure 5 shows the speed–time graph for a car moving between the two

cameras.

Figure 5

.

The speed limit for the motorway between the two cameras is 22 m s

−

.

box

Determine whether the average speed of the car exceeded this

speed limit.

[3 marks]

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Markings called chevrons are used on motorways.

The chevron separation is designed to give a driver time to respond to

any change in speed of the car in front. The driver is advised to keep a

minimum distance d behind the car in front, as shown in Figure 6.

Figure 6

Government research suggests that the typical time for a driver to respond

is between

1.6 s and 2.0 s.

Suggest a value for d where the speed limit is 31 m s

−

.

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[2 marks]

d = m

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.

The chevron separation is based on the response time, not on the time

taken for a car to stop.

The brakes of a car are applied when its speed is 31 m s

−

and the car

comes to rest. The total mass of the car is 1200 kg.

The average braking force acting on the car is 6.8 kN.

Calculate the time taken for the braking force to stop the car and

the distance travelled by the car in this time.

box

[4 marks]

time = s

distance = m

.

Suggest why the chevron separation on motorways does not take into

account the distance travelled as a car comes to rest after the brakes

are applied.

[1 mark]

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At bends on motorways the road is sloped so that a car is less likely to

slide out of its lane when travelling at a high speed.

Figure 7 shows a car of mass 1200 kg travelling around a curve of radius

200 m. The motorway is sloped at an angle of 5.0°.

Figure 8 shows the weight W and reaction force N acting on the car. The

advisory speed for the bend is chosen so that the friction force down the

slope is zero.

Figure 7

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Suggest an appropriate advisory speed for this section of the

motorway.

[4 marks]

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advisory

speed =

m s

−1

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17

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Figure 9 shows some of the apparatus used in a demonstration of electrical power

transmission using a dc power supply.

Figure 9

A power supply of emf 12 V and negligible internal resistance is

connected to three identical 12 V, 1.5 W lamps in parallel.

box

.

Show that the resistance of one of the lamps when it is operating

at 12 V is about 100 Ω.

[1 mark]

.

Initially the power supply is connected to the lamps using two short

copper wires of negligible resistance.

Calculate the current in the power supply.

[2 marks]

current = A

1 

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• 24 *

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The two short copper wires are replaced with two long constantan wires.

Show that the resistance of each length of constantan wire is about 50 Ω.

length of each constantan

wire diameter of

constantan wires

resistivity of constantan

= 2.8 m

= 0.19 mm

= 4.9 × 10

−7

Ω m

[3 marks]

The demonstration is intended to show that the lamps are significantly

dimmer when connected using the long constantan wires than when using

the short copper wires.

Discuss whether the demonstration

achieves this. Support your answer with

suitable calculations.

[4 marks]

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