Uses of EM (Edexcel GCSE Physics Combined Science): Flashcards
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Practise the cards
15 cards from this deck
Why radio waves travel long distances
Why radio waves travel long distances
Travel far before absorption by buildings and trees
How longer radio waves spread between hills
How longer radio waves spread between hills
Through diffraction
Why radio waves travel around Earth
Why radio waves travel around Earth
Reflect off charged particles in ionosphere
How microwaves heat food
How microwaves heat food
Water molecules absorb energy, increasing temperature
Why microwaves used for satellite communication
Why microwaves used for satellite communication
Pass through atmosphere without refraction/reflection
Why infrared used in electrical heaters
Why infrared used in electrical heaters
Energy easily absorbed by surface of objects
Use of infrared cameras in buildings
Use of infrared cameras in buildings
Check for heat losses
What fibre optics transmit
What fibre optics transmit
Pulses of light to carry information
What digital camera image sensors do
What digital camera image sensors do
Detect visible light, convert to electrical signal
What is fluorescence
What is fluorescence
Chemicals absorb UV radiation, re-emit as visible light
How gamma rays sterilise medical instruments
How gamma rays sterilise medical instruments
Kill bacteria and microbes
How gamma rays treat cancer
How gamma rays treat cancer
Targeted at cancer cells to destroy them
What X-rays pass through vs absorbed by
What X-rays pass through vs absorbed by
Pass through soft tissue, absorbed by dense materials
Medical imaging use of X-rays
Medical imaging use of X-rays
Diagnose broken bones
Effect when EM wavelength decreases (speed constant)
Effect when EM wavelength decreases (speed constant)
Frequency must increase