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Electromagnetic spectrum
Electromagnetic waves are coupled time varying electric and magnetic fields, propagating in space, with the speed very close to that of light `(3xx10^8 ms^-1)`. An the orderly distribution and classification of electromagnetic waves according to their frequency or wavelength is called electromagnetic spectrum. electromagnetic waves inclued visible light, ultraviolet waves, infra red waves, X-rays, gamma-rays, microwaves and radiowaves.
Which of the following belongs to the electromagnetic spectrum

A

`alpha rays`

B

`beta rays`

C

ultrasonic waves

D

`gamma rays`.

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