UPSC Geography The origin and evolution of the earth Question Bank Universe / Sun / Planets / Earth

  • question_answer Consider the following statements
    1. The Earth receives the Sun's energy at the infrared end of the spectrum.
    2. The Earth re-radiates the Sun's heat as ultraviolet energy.
    Which of the statement(s) given above is/are correct?   

    A)  1 only                         

    B)  2 only                         

    C)  Both 1 and 2                

    D)  Neither 1 nor 2        

    Correct Answer: D

    Solution :

     The sun radiates vast quantities of energy into space, across a wide spectrum of wavelengths. Most of the radiant energy from the sun is concentrated in the visible and near-visible parts of the spectrum. The narrow band of visible light, between 400 and the 700 nm, represents 43% of the total radiant energy emitted. Wavelengths shorter than the visible account for 7 to 8% of the total, but are extremely important because of their high energy per photon. The shorter the wavelength of light, the more energy it contains.

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