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Section 3c: The Electromagnetic Spectrum (. (radio waves uses:…
Section 3c: The Electromagnetic Spectrum
.
radio waves
uses: communications & broadcasting
dangers: none
.
microwaves
uses: cooking & satellite transmissions
dangers: internal heating of body tissue, burns, cataracts, cancer
.
infra-red radiation
uses: heaters & night vision equipment
dangers: skin burns
.
visible light
uses: optical fibres & photography
dangers: eye damage
.
1 more item...
rainbows =visible light
increasing wavelength in nm
→
all transverse waves and all travel at the same speed through free space (a vacuum)
the different colours of visible light depend on the wavelength - red has the longest wavelength (lowest frequency) and violet the shortest (highest frequency)
Richard of York Gave Battle In Vain
Red Orange Yellow Green Blue Indigo Violet
speed is the same as speed of light
reflected, refracted