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    Question

    The sky appears blue because of

    –
    A Atmospheric water vapour Correct Answer Incorrect Answer
    B Scattering of light Correct Answer Incorrect Answer
    C Reflection on sea water Correct Answer Incorrect Answer
    D Emission of blue wavelength by the sun Correct Answer Incorrect Answer

    Solution

    The sky is blue because the molecules in the air scatter light in the higher wavelengths (that is, the blue light), while lower wavelength light (that is, the light on the red end of the spectrum) goes through to the ground. So the light that get finally reflected down from the scattering is blue, therefore a blue sky. This is called Rayleigh scattering.

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