Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
The Electromagnetic Spectrum
70 practice questions
Topics covered
Practice questions
41–50 of 70
Question 41
3 marks · Normal
Answer and see the solution →Microwave ovens have metal screens on the doors.
(a)[2 marks]Explain why it is important for microwave ovens to have metal screens.
(b)[1 mark]Describe what could happen if a microwave oven did not have a metal screen.
Question 42
4 marks · Normal
Answer and see the solution →Microwaves are used in mobile phones to carry signals.
(a)[2 marks]Describe one benefit and one risk of using microwaves in mobile phone technology.
(b)[1 mark]Suggest one way people can reduce the risk you described in part (a).
(c)[1 mark]Explain why mobile phone microwaves do not cook your brain.
Question 43
3 marks · Normal
Answer and see the solution →A company is designing a new microwave oven. They want to ensure it is both efficient and safe.
(a)[2 marks]Explain how microwaves heat food inside an oven.
(b)[1 mark]Describe one design feature that makes a microwave oven safe for users.
Question 44
4 marks · Normal
Answer and see the solution →Microwaves are part of the electromagnetic spectrum and have a wide range of applications.
(a)[2 marks]Explain why microwaves are used to send signals to and from satellites, rather than radio waves.
(b)[2 marks]Describe one reason why microwave ovens cook food differently compared to conventional ovens.
Question 45
1 mark · Normal
Answer and see the solution →Which of the following is a detrimental effect of excessive exposure to microwaves in the home?
- A.Can cause burns to human tissue
- B.Causes electric shocks
- C.Can permanently magnetise metals
- D.Can damage bone structure
Question 46
3 marks · Normal
Answer and see the solution →A student is comparing different ways microwaves and radio waves are used in technology. Complete the table below by stating one key use for each wave, and one safety concern linked to each.
Wave Example of a use One safety concern Microwaves Radio waves Question 47
3 marks · Normal
Answer and see the solution →A person spends a long time standing close to a malfunctioning microwave oven that is leaking microwaves.
(a)[2 marks]State and explain one harmful effect this exposure could have on the person’s body.
(b)[1 mark]Suggest one way the design of a microwave oven helps to prevent this effect.
Question 48
2 marks · Normal
Answer and see the solution →A student claims that using mobile phones is completely safe since microwaves have less energy than other waves in the electromagnetic spectrum. Do you agree? Give one scientific reason for your answer.
Question 49
1 mark · Easy
Answer and see the solution →State the relationship between an object's temperature and the amount of infrared radiation it emits.
Question 50
2 marks · Easy
Answer and see the solution →A person stands near an electric fire. Explain how the electric fire warms the person using infrared radiation.