Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Waves
356 practice questions
Topics covered
Practice questions
21–30 of 181 · Normal
Question 21
2 marks · Normal
Answer and see the solution →Describe what is meant by the frequency of a wave.
Question 22
2 marks · Normal
Answer and see the solution →A student uses a ripple tank to produce waves with a wavelength of 0.04 m. The tank's motor produces 25 waves every second. Calculate the speed of the water waves.
Question 23
2 marks · Normal
Answer and see the solution →A radio wave has a frequency of 6 × 10^8 Hz and travels at a speed of 3 × 10^8 m/s. Calculate its wavelength.
Question 24
3 marks · Normal
Answer and see the solution →A student states, 'If the frequency of water waves in a ripple tank is doubled, the speed of the waves will also double.'
Explain whether this statement is correct.
Question 25
2 marks · Normal
Answer and see the solution →Describe two observations that show how increasing the frequency of a ripple tank motor changes the pattern of waves seen.
Question 26
2 marks · Normal
Answer and see the solution →State what is meant by refraction and explain why refraction occurs when a light ray passes from air into water.
Question 27
3 marks · Normal
Answer and see the solution →A ray of light passes from air into a block of glass. The diagram below shows the path of the ray.
Ray of light entering glass (a)[2 marks]On the diagram, clearly label the angle of incidence and the angle of refraction.
(b)[1 mark]State which of the two angles (angle of incidence or angle of refraction) is larger and explain why.
Question 28
4 marks · Normal
Answer and see the solution →The diagram shows the direction of a wave as it passes from shallow water into deep water at an angle. The wave changes speed and is refracted.
Wave passing from shallow to deep water (a)[2 marks]Describe what happens to the speed and direction of the wave as it passes from shallow to deep water.
(b)[2 marks]Explain why the direction of the wavefront changes.
Question 29
1 mark · Normal
Answer and check →Which statement explains why a pencil appears bent when placed in a glass of water?
- A.Light is absorbed by the water.
- B.Light is reflected off the pencil.
- C.Light travels at the same speed in water and air.
- D.Light is refracted as it passes from air to water.
Question 30
2 marks · Normal
Answer and see the solution →Explain how the path of a sound wave changes as it moves from warm air into cold air at an angle.