Syllabus Edition

First teaching 2023

First exams 2025

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Transverse & Longitudinal Waves (CIE A Level Physics)

Exam Questions

58 mins19 questions
1a
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1 mark

Define a transverse wave.

1b
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2 marks

State two properties of a longitudinal wave.

1c
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2 marks

State two examples of transverse waves.

1d
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2 marks

State two examples of longitudinal waves.

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2a
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2 marks

Fig. 1.1 shows graphs of waves X and Y. The scales of the graphs are identical.

4-3-q2d-question-stem-sl-sq-easy-phy

Fig. 1.1

Describe two similarities between the properties of waves X and Y.

2b
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1 mark

State one difference between waves X and Y.

2c
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2 marks

Distinguish between transverse and longitudinal waves.

2d
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1 mark

Explain how it could be determined whether waves X and Y are transverse or longitudinal.

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1a
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2 marks

Explain what is meant by a progressive wave.    

1b
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4 marks

An elastic cord is fixed at one end and attached to a mechanical oscillator at the other end. Fig. 1.1 shows, at time t = 0, the shape of a section of the cord as the wave travels from left to right. W, X, Y and Z are four marked points on the cord.

7-1-3b-m-waves-graph-1

The mechanical oscillator has a steady frequency of 5.0 Hz. The wave has a wavelength of 0.60 m and an amplitude of 0.030 m.

On the axes of Fig. 1.2 sketch the graph of the displacement of point X over the period t = 0 to 0.40 s. Add suitable scales to the axes.

7-1-3b-m-waves-graph-2
1c
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2 marks

For time t = 0, state which of the points W, X, Y and Z   

i)
is instantaneously at rest
[1]
ii)
has the greatest speed
[1]
1d
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2 marks

The speed of point W on the cord at t = 0 is 0.94 m s–1. With the cord at its original tension, the frequency of oscillation is now doubled to 10 Hz.

The amplitude is kept at 0.030 m. Calculate the new speed of point W at t = 0. Explain your reasoning.

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2a
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3 marks

Explain briefly how transmission of energy by a longitudinal wave differs from transmission of energy by a transverse wave. Give one example of a transverse wave.

2b
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3 marks

With the aid of a clearly labelled diagram explain how a sound wave in air transmits energy away from its source.

2c
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3 marks

Short pulses of sound are reflected from a wall 30 m from the sound source. The reflected pulses return to the source after 0.18 s.

Calculate the speed of sound.

2d
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3 marks

Fig.1.1 represents the sound wave from part (c).

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Fig. 1.1

Calculate the frequency of the sound wave.

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3a
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2 marks

A large water tank is set up so that a wave can be generated at each end of the tank. The two waves, A and B, travel towards each other at the same speed.

Fig. 1.1 shows the variation of displacement of the water surface with distance travelled at a particular instant.q1a_wave-characteristics_ib-sl-physics-sq-medium

Fig. 1.1

Deduce how many times greater the amplitude of B is to the amplitude of A.

3b
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4 marks

Wave A has a frequency of 8.0 Hz.

q1a_wave-characteristics_ib-sl-physics-sq-medium

Fig. 1.1 

(i)
Calculate the velocity of wave A.
[2]
 
(ii)
Determine the frequency of wave B.
[2]
              

 

3c
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3 marks

Explain how the stationary wave is generated in the tank.

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