Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Properties of Waves
122 practice questions
Topics covered
Practice questions
101–110 of 122
Question 101
1 mark · Easy
Answer and see the solution →Complete the sentence: The Doppler effect applies to _______ types of waves.
Question 102
3 marks · Easy
Answer and see the solution →Consider a moving car sounding its horn.
(a)[1 mark]Describe what happens to the spacing of the sound wavefronts in front of the moving car.
(b)[2 marks]Explain how the change in wavefront spacing affects the pitch (frequency) of the sound heard by an observer in front of the car.
Question 103
1 mark · Easy
Answer and check →Which effect will a stationary observer notice when a sound source moves away from them at high speed?
- A.The sound increases in frequency (higher pitch).
- B.The sound decreases in frequency (lower pitch).
- C.The sound remains at the same frequency.
- D.The sound waves are reflected back.
Question 104
1 mark · Easy
Answer and see the solution →State whether the wavelength of waves increases or decreases in the direction a source is moving.
Question 105
3 marks · Easy
Answer and see the solution →The diagram below shows wavefronts produced by a stationary and a moving sound source.
Sound waves from stationary and moving sources (a)[1 mark]Identify which set of wavefronts shows the effect of movement.
(b)[2 marks]Explain how the spacing of these wavefronts demonstrates the Doppler effect.
Question 106
1 mark · Easy
Answer and see the solution →Name one type of wave, other than sound, that can demonstrate the Doppler effect.
Question 107
1 mark · Normal
Answer and check →Which statement best describes the Doppler effect?
- A.It is the apparent change in frequency of a wave due to the movement of the source.
- B.It describes the reflection of waves at a boundary.
- C.It is the process of splitting white light into its component colours.
- D.It explains why sound cannot travel through a vacuum.
Question 108
2 marks · Normal
Answer and see the solution →Describe what happens to the wavelength and frequency of sound waves ahead of a car as it moves towards a stationary observer.
Question 109
3 marks · Normal
Answer and see the solution →A train travels towards a platform at high speed.
(a)[2 marks]Explain how the frequency of the sound heard by a person standing on the platform compares to the frequency emitted by the train.
(b)[1 mark]If the train then stops, what happens to the sound's frequency for the person on the platform?
Question 110
4 marks · Normal
Answer and see the solution →A police car moves directly towards a stationary observer at a speed of 30 m/s. The siren emits a sound with a frequency of 800 Hz. The speed of sound in air is 340 m/s.
(a)[1 mark]Explain why the observer hears a higher frequency as the car approaches.
(b)[3 marks]Calculate the observed frequency of the siren heard by the observer. Give your answer to 2 significant figures.