Uses of EM (Edexcel GCSE Physics): Quizzes
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14 questions from this quiz
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Practise the questions
14 questions from this quiz
Why can radio waves travel long distances around the Earth?
Why can radio waves travel long distances around the Earth?
They reflect off the ionosphere
Why can longer radio waves spread out between hills?
Why can longer radio waves spread out between hills?
Due to diffraction
How do microwaves heat food?
How do microwaves heat food?
Water molecules absorb microwave energy
Why are microwaves suitable for satellite communication?
Why are microwaves suitable for satellite communication?
They pass through atmosphere unchanged
What are infrared cameras used to detect in buildings?
What are infrared cameras used to detect in buildings?
Heat losses
What do optical fibres transmit for communication?
What do optical fibres transmit for communication?
Pulses of light
What do digital camera image sensors convert light into?
What do digital camera image sensors convert light into?
An electrical signal
What is fluorescence?
What is fluorescence?
Chemicals absorb UV, re-emit visible light
Why are UV light bulbs more energy-efficient?
Why are UV light bulbs more energy-efficient?
UV has shorter wavelength
How do gamma rays sterilise food?
How do gamma rays sterilise food?
Kill bacteria and microbes
What do X-rays pass through that bones absorb?
What do X-rays pass through that bones absorb?
Soft tissue
How do denser materials appear on X-ray images?
How do denser materials appear on X-ray images?
As brighter areas
What type of wave are electromagnetic waves?
What type of wave are electromagnetic waves?
Transverse waves
What happens to energy as EM wave frequency increases?
What happens to energy as EM wave frequency increases?
Energy of the wave increases