Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
The Electromagnetic Spectrum
70 practice questions
Topics covered
Practice questions
51–60 of 70
Question 51
1 mark · Easy
Answer and check →Which statement about infrared radiation is correct?
- A.Infrared radiation can travel through a vacuum.
- B.Infrared radiation cannot travel through air.
- C.Infrared radiation is only present in sunlight.
- D.Infrared radiation is visible to the human eye.
Question 52
3 marks · Easy
Answer and see the solution →A loaf of bread is placed under a toaster grill. The grill heats up and glows red.
(a)[1 mark]Identify the type of electromagnetic radiation emitted by the hot grill.
(b)[2 marks]Explain how this radiation cooks the bread.
Question 53
1 mark · Easy
Answer and see the solution →State one way that infrared radiation can be harmful to the human body.
Question 54
2 marks · Easy
Answer and see the solution →Two identical beakers of water are placed at the same distance from an infrared lamp. Beaker 1 is covered with shiny foil, and Beaker 2 is covered with matte black paper. Both are left under the lamp for 5 minutes. Predict which beaker will be warmer at the end and explain why.
Question 55
2 marks · Easy
Answer and see the solution →A person checks their home for heat loss using an infrared camera. Explain why the camera is able to identify areas losing heat.
Question 56
1 mark · Easy
Answer and check →Which is a correct use of infrared radiation?
- A.Heating food in a grill
- B.Detecting gamma rays
- C.Transmitting X-rays for dental pictures
- D.Emitting blue light from an LED
Question 57
4 marks · Normal
Answer and see the solution →All objects emit infrared radiation. A hot stone is left to cool in a cold room.
(a)[2 marks]Explain why the stone emits more infrared radiation as its temperature increases.
(b)[2 marks]Name two household appliances or devices that use infrared radiation for their operation.
Question 58
2 marks · Normal
Answer and see the solution →State two uses of infrared radiation other than for heating.
Question 59
3 marks · Normal
Answer and see the solution →Special cameras designed to detect infrared waves can be used to find people in darkness, such as in a rescue operation after a building collapse. Infrared images show hot bodies as white shapes against a dark background.
(a)[3 marks]Explain why infrared cameras are useful for finding people in such situations.
Question 60
3 marks · Normal
Answer and see the solution →A metal plate is heated by an infrared lamp. The initial temperature of the plate is , and it rises to after 3 minutes of heating.
(a)[2 marks]Describe, using ideas about infrared radiation, why the temperature of the plate increases when placed under the lamp.
(b)[1 mark]State an effect of increasing the power of the lamp on the rate at which the plate heats up.