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P1.6 The Electromagnetic Spectrum

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Electromagnetic spectrum
A set of radiations that have differant wavelenths and frequencies but all travel at the same speed in a vacuum
Wave speed
Speed of travel of a wave.
White light
Light that consists of all the colours of the visible spectrum.
Optical fibres
Thin glass fibre used to send light signals along.
Part of the radio and microwave spectrum used for communications.
radio wave
The longest wavelength of electromagnetic radiation.
Electromagnetic radiation with a wavelength of 1-2cm. Used by mobile phones.
Infrared radiation
Electromagnetic radiation that has a slightly longer wavelength than red light, transmits heat energy.
Visible light
The part of the electromagnetic spectrum that can be detected by the human eye.
Doppler effect
The change of wavelength (and frequency) of the waves from a moving source due to the motion of the source towards or away from the observer.
Ultraviolet Light
The part of the EM spectrum with a slightly higher frequency than visible light, used in tanning booths and many birds can see this kind of light.
Cosmic microwave background radiation
Electromagnetic radiation that has been travelling through space ever since it was created shortly after the big bang.
Very short wavelength EM radiation which can be used to produce images of bones. It is ionising.
Big Bang theory
The theory that the universe was created in a massive explosion and that the universe has been expanding ever since.
Gamma rays
The shortest wavelength EM radiation which can be used to sterilise objects. It is ionising.