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Q. Why does the sky appear blue in colour?
As-per to the Rayleigh's scattering law the shorter wavelengths are scattered much more than the longer wavelengths. The blue look of sky is due to scattering of sunlight by the atmosphere. Blue light is scattered to a bigger extent than red light.
This scattered radiation results the sky to appear blue.
how may six digit numbers can be made in which the sum of the digits is even?
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It is the force that the field would exert on any unit magnetic pole placed in the field. It is also known as magnetic force.
Give the theory of plane diffraction grating for normal incidence.
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