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Answer the following, giving reason:- ...

Answer the following, giving reason:-
(a) When light travels from a denser to a rarer medium, the speed increases. Does it mean that there is an increase in the energy carried by the waves ?
(b) The Sun appears reddish at sunset and sunrise.

Text Solution

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(a) Energy carried by the wave does not change. Denser to rarer medium Speed of light increases, wavelength also increases but frequency remains same.
`V=(V)/(lambda), = (c)/(lambda)`
(b) At sunset and sunrise, the sun’s rays have to pass through a longer distance in the atmosphere. Most of the blue and other shorter wave lengths are removed by scattering. The least scattered light reaches our eyes. Therefore, sun looks reddish.
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