Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Waves
356 practice questions
Topics covered
Practice questions
111–120 of 172 · Easy
Question 111
1 mark · Easy
Answer and check →Which group of electromagnetic waves is visible to the human eye?
- A.Infrared
- B.Radio waves
- C.Ultraviolet
- D.Visible light
Question 112
2 marks · Easy
Answer and see the solution →Microwaves are part of the electromagnetic spectrum.
(a)[1 mark]State one use of microwaves.
(b)[1 mark]State whether microwaves have a higher or lower frequency than infrared waves.
Question 113
2 marks · Easy
Answer and see the solution →The electromagnetic spectrum is a continuous spectrum. Answer the following questions.
(a)[1 mark]State what is meant by a 'continuous spectrum'.
(b)[1 mark]Is there a clear boundary between types of electromagnetic waves? Answer yes or no.
Question 114
1 mark · Easy
Answer and see the solution →What happens to the wavelength of electromagnetic waves as the frequency increases?
Question 115
1 mark · Easy
Answer and check →Which statement about all electromagnetic waves is correct?
- A.They all travel at different speeds in a vacuum.
- B.They are all longitudinal waves.
- C.They all transfer energy.
- D.They cannot be reflected.
Question 116
2 marks · Easy
Answer and see the solution →State two uses of microwaves, other than for cooking food.
Question 117
1 mark · Easy
Answer and check →Which statement best explains why microwave ovens cook food more quickly than ordinary ovens?
- A.Microwaves heat only the air around the food.
- B.Microwaves heat the metal inside the oven.
- C.Microwaves are absorbed by water molecules in the food, heating it throughout.
- D.Microwaves make the outside of the food hotter than the inside.
Question 118
3 marks · Easy
Answer and see the solution →Explain why it is important that microwave ovens have metal screens or mesh on their doors. What could happen if there was no screen?
Question 119
2 marks · Easy
Answer and see the solution →Describe one protective measure you could take to reduce the risk from excessive exposure to microwaves, and explain how it works.
Question 120
1 mark · Easy
Answer and check →Which of the following is a common use of microwaves?
- A.Heating food in microwave ovens
- B.Medical X-rays for imaging bones
- C.Detecting heat loss with infrared cameras
- D.Controlling TVs with a remote control