Electromagnetic Spectrum
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33 Terms
What is the frequency of Radio waves/Microwaves?
3KHz - 300GHz
What is the wavelength of radio waves/microwaves?
100km-1mm
What is the wavelength of infrared radiation?
1mm - 700nm
What is the frequency of infrared radiation?
300GHz - 430THz
What is the wavelength of visible light?
700nm - 400nm
What is the frequency of visible light?
400THz - 800THz
What is the wavelength of ultraviolet light?
400nm - 10nm
What is the frequency of Ultraviolet light?
8 × 10¹⁴ Hz - 3 × 10¹⁶ Hz
What is the wavelength of x-rays?
10nm - 0.01nm
What is the frequency of x-rays?
3 × 10¹⁶ Hz - 3 × 10¹⁹ Hz
What is the wavelength of gamma rays?
0.01nm and smaller
What is the frequency of gamma rays?
3 × 10¹⁹ Hz and higher
What are the uses of radio waves?
TV and radio; astronomy
What are the risks of radio waves?
none, they are non-ionising and carry low energy
What are the uses of microwaves?
mobile communications; cooking food; communication with satellites
What are the risks of microwaves?
none, they are non-ionising and carry low energy
What are the uses of infrared radiation?
thermal imaging cameras; used by police; mimlitary; search and rescue; some animals use infrared to see; can be used in medical treatments; astronomy; oceanography; firefighters
What are the risks of infrared radiation?
It is non-ionising and doesn’t cause cancer, but can cause burns.
What are the uses of visible light?
Humans use to see; endoscopes use to show images of inside the body
What are the risks of visible light?
Non-ionising, won’t cause cancer, but potential eye damage specifically to the retina
What are the uses of ultraviolet light?
Sterilisation of water; detecting real/fake bank notes; flourescent lights; sun beds
What are the risks of ultraviolet light
Ionising radiation; can cause cancer or mutations; can damage dna; sunburn
What are the uses of x-rays
used in medicine; x-ray scans; ct scans (3d x-ray)
What are the risks of x-rays
ionising; can cause cancer
what are the uses of gamma rays
used to sterilise hospital equipment and treat certain cancers
what are the risks of gamma rays?
can cause cancer; ionising
In a vacuum, all EM waves travel at…
…the speed of light, which is 3 × 10⁸ m/s
Which colour is the best emitter of infrared radiation?
matt black
Which colour is the best absorber of infrared radiation?
matt black
Which colour is the worst reflector
matt black
Which colour is the worst emitter?
Silver
Which colour is the best reflector?
Silver
Which colour is the worst absorber?
Silver