Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
The Electromagnetic Spectrum
70 practice questions
Topics covered
Practice questions
31–40 of 70
Question 31
3 marks · Normal
Answer and see the solution →Describe how the frequency and wavelength change as you move from radio waves to gamma rays across the electromagnetic spectrum.
Question 32
4 marks · Normal
Answer and see the solution →A student reads that all electromagnetic waves can be reflected and refracted. They want to investigate this for light.
Describe a laboratory experiment the student could perform to demonstrate the reflection and refraction of visible light, mentioning the main pieces of apparatus required.
(a)[1 mark]State the apparatus the student would need.
(b)[1 mark]Describe the procedure for demonstrating reflection.
(c)[1 mark]Describe the procedure for demonstrating refraction.
(d)[1 mark]State one observation the student could make in either part.
Question 33
2 marks · Easy
Answer and see the solution →State two uses of microwaves, other than for cooking food.
Question 34
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 35
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 36
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 37
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
Question 38
3 marks · Easy
Answer and see the solution →Microwaves are widely used in satellite communication and cooking.
(a)[1 mark]State one reason why microwaves are suitable for use in satellite communications.
(b)[2 marks]Explain why metal screens are used in the doors of microwave ovens.
Question 39
2 marks · Easy
Answer and see the solution →Explain one possible detrimental effect of excessive exposure to microwaves on the human body. Suggest one way to reduce the risk.
Question 40
4 marks · Normal
Answer and see the solution →Microwaves are used in a variety of everyday applications.
(a)[2 marks]State two uses of microwaves, other than for cooking food.
(b)[2 marks]Explain why microwaves are suitable for the uses in part (a).