The Electromagnetic Spectrum
4 marks · EasyA scientist wants to use different types of electromagnetic waves for different purposes. She has a radio, a remote control, and a thermometer that can measure heat without touching the object.
Which type of electromagnetic wave is used by the radio to carry signals?
Which type of wave is used by the remote control?
Which type of wave does the thermometer use to measure heat?
Arrange these three waves in order of increasing frequency.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) Radio waves
(b) Infrared waves
(c) Infrared waves
(d) Radio waves, infrared waves, visible light
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · States radio waves for radio signals.
B1 (b) · 1 mark · States infrared waves for remote controls.
B1 (c) · 1 mark · States infrared waves for a thermometer that detects heat.
B1 (d) · 1 mark · Correctly orders radio, infrared, visible by increasing frequency.
Worked solution
a) Radio waves are used by radios to carry signals.
b) Remote controls use infrared waves.
c) The thermometer uses infrared waves to measure heat.
d) In order of increasing frequency: radio waves, infrared waves, visible light.