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GCSE Questions - Electromagnetic Spectrum

Q11. (a) The diagram shows the position of three types of wave in the electromagnetic spectrum.

(i) Which letter represents infrared in the electromagnetic spectrum?

[1 mark]

(ii) Which of the following is infrared used for? Tick one box.

Electrical heating  
Energy efficient lamps  
Satellite communications  
Sun tanning  

 

[1 mark]

(b) An infrared camera produces a colour image. Different colours show box different temperatures. People emit infrared radiation. The photo below shows how the colour of the image of a person on an infrared camera depends on the person's body temperature.

(i) What colour would an image produced by an infrared camera of a person with a body temperature of 37 °C be mainly composed of?

[1 mark]

(ii) Rescue workers use infrared cameras to search for people trapped under rubble after an earthquake.

How does the image of a trapped person change if the person's body temperature drops from 37 °C to 33 °C?

[1 mark]

(c) Jimmy investigated how the type of surface affects the amount of infrared the surface radiates. This diagram shows the equipment used.

(i) What kind of variable in this investigation is 'type of surface'?

[1 mark]

(ii) Describe how the equipment shown above would be used to compare the infrared radiation emitted from the vertical surfaces of the cube.

[3 marks]

The table shows the results:

Type of surface
Temperature in °C
Matt black
68.0
Matt white
65.5
Shiny black
66.3
Shiny silver
28.0

(iii) What is the resolution of the infrared detector?

[1 mark]

This bar chart shows two of the results:

(iv) Complete the bar chart to show all of the results.

[3 marks]

(v) Give one conclusion that can be made from the results.

[1 mark]

(Total 13 marks)