Uses of EM (Edexcel GCSE Physics): Flashcards
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15 cards from this deck
What distance can radio waves travel?
What distance can radio waves travel?
Long distances before being absorbed
How do longer radio waves behave between hills?
How do longer radio waves behave between hills?
Spread out due to diffraction
How do radio waves use the ionosphere?
How do radio waves use the ionosphere?
Reflect off it to travel long distances
How do microwaves heat food?
How do microwaves heat food?
Water molecules absorb energy, increasing temperature
How do microwaves pass through Earth's atmosphere?
How do microwaves pass through Earth's atmosphere?
Without refraction or reflection
How is infrared energy absorbed?
How is infrared energy absorbed?
Easily absorbed by surface of objects
What are infrared cameras used for in buildings?
What are infrared cameras used for in buildings?
Checking for heat losses
How does visible light work in fiber optics?
How does visible light work in fiber optics?
Transmits pulses of light to carry information
What is fluorescence?
What is fluorescence?
Chemicals absorb UV, re-emit as visible light
What are gamma rays used for in sterilisation?
What are gamma rays used for in sterilisation?
Sterilising medical instruments by killing bacteria
How are gamma rays used in cancer treatment?
How are gamma rays used in cancer treatment?
Targeted at cancer cells to destroy them
How do X-rays behave through body tissues?
How do X-rays behave through body tissues?
Pass through soft tissue, absorbed by denser materials
What is the velocity of EM waves in space?
What is the velocity of EM waves in space?
All have same velocity (speed of light)
Wavelength decreases, frequency...
Wavelength decreases, frequency...
Increases (speed is constant)
Frequency increases, wave energy...
Frequency increases, wave energy...
Increases