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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.
The wavelength range of visible light is

A

`4xx10^-9 m to 8xx10^-9 m`

B

`4 xx 10^-7 m to 8 xx 10^-7m`

C

`4xx10^-5 m to 8xx10^-5 m`

D

`4 xx 10^-3 m to 8xx10^-3 m`

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