Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Units (Waves)
82 practice questions
Topics covered
Practice questions
21–30 of 40 · Easy
Question 21
2 marks · Easy
Answer and see the solution →A wave has a frequency of 50 Hz and a wavelength of 0.12 m. Calculate the speed of this wave.
Question 22
1 mark · Easy
Answer and see the solution →Give the unit used for frequency.
Question 23
1 mark · Easy
Answer and see the solution →Describe what happens to the wavelength of a water wave when its frequency is doubled, with speed kept constant.
Question 24
3 marks · Easy
Answer and see the solution →A fishing float moves up and down as waves pass beneath it. The float completes one up-and-down motion every 0.8 seconds.
(a)[2 marks]Calculate the frequency of the wave.
(b)[1 mark]Explain what is meant by the term 'frequency' in this context.
Question 25
1 mark · Easy
Answer and see the solution →State what is meant by refraction.
Question 26
2 marks · Easy
Answer and see the solution →A ray of light passes from air into water. Explain why the ray changes direction at the boundary between the two media.
Question 27
3 marks · Easy
Answer and see the solution →The diagram shows a light ray entering a glass block from air at an angle to the normal.
(a)[2 marks]On the diagram below, draw and label:
the normal at the point where the ray enters the glass
the angle of incidence
(b)[1 mark]What happens to the speed of light as it passes from air into glass?
Question 28
1 mark · Easy
Answer and check →Which statement best describes why refraction occurs when a wave moves from air into glass?
- A.The wave is absorbed by the glass.
- B.The wave travels at a different speed in the glass.
- C.The wave is reflected at the surface of the glass.
- D.The wave loses all its energy in the glass.
Question 29
1 mark · Easy
Answer and see the solution →Name one instrument that uses lenses to refract light and form an image.
Question 30
2 marks · Easy
Answer and see the solution →When water waves pass into a region where the water is deeper, describe what happens to the speed and direction of the waves.