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  • The clear sky appears blue because (a) blue light gets absorbed in the atmosphere (b) ultraviolet radiations are absorbed in the atmosphere (c) violet and blue lights get scattered more than lights of all other colours by the atmosphere

The clear sky appears blue because
(a) blue light gets absorbed in the atmosphere
(b) ultraviolet radiations are absorbed in the atmosphere
(c) violet and blue lights get scattered more than lights of all other colours by the atmosphere
(d) light of all other colours is scattered more than the violet and blue colour lights by the atmosphere

Answers (1)

Ans. (c)

Amount of scattering is inversely proportional to fourth power of wavelength.

The wavelengths of colours are given below:

Colour  Approximate wavelength (nm)
Red 650
Orange 600
Yellow 580
Green 550
Cyan 500
Blue 450
Violet 400

Based on the above data, blue and violet colours scatter the most.
Hence, the clear sky appears blue due to scattering of sunlight.
Therefore option (c) is correct.

Posted by

infoexpert26

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