Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Units (Waves)
82 practice questions
Topics covered
Practice questions
61–70 of 82
Question 61
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 62
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.
Question 63
3 marks · Normal
Answer and see the solution →A ray of light passes from air (speed in air = m/s) into glass (speed in glass = m/s). Calculate the refractive index of glass to two significant figures.
Question 64
4 marks · Normal
Answer and see the solution →A student shines a ray of light at an angle on the surface of water in a tank. Some of the ray is reflected and some is refracted. The diagram shows the ray and the normal.
Light ray striking water surface Use the diagram to answer the following.
(a)[2 marks]Which ray shows reflection? Which shows refraction? Write their labels.
(b)[2 marks]Describe the difference between reflection and refraction using this example.
Question 65
3 marks · Normal
Answer and see the solution →Describe an experiment a student could carry out to investigate the refraction of light as it passes from air into glass. Include the apparatus needed and the steps in the method.
Question 66
1 mark · Easy
Answer and see the solution →State the name given to the apparent change in frequency of a wave caused when either the source or an observer moves relative to the other.
Question 67
2 marks · Easy
Answer and see the solution →Describe how the wavelength of sound waves changes in front of a moving source compared to behind it.
Question 68
1 mark · Easy
Answer and check →Which change will a person hear as a sound source moves towards them?
- A.A higher-pitched sound
- B.A lower-pitched sound
- C.A quieter sound
- D.No change in sound
Question 69
2 marks · Easy
Answer and see the solution →Explain, using the idea of wavefronts, why the pitch of an approaching ambulance siren is higher than when it is stationary.
Question 70
3 marks · Easy
Answer and see the solution →A cyclist is ringing a bell as she moves along a road.
(a)[1 mark]What effect does her motion have on the sound heard by someone in front of her?
(b)[1 mark]What effect does her motion have on the sound heard by someone behind her?
(c)[1 mark]Name the effect described in a) and b).