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    Question

    Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by –

    A Carbon dioxide Correct Answer Incorrect Answer
    B Ammonia Correct Answer Incorrect Answer
    C Chlorine Correct Answer Incorrect Answer
    D Ozone Correct Answer Incorrect Answer

    Solution

    The ozone layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth. Ozone is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges, and is present in low concentrations   throughout   the   Earth's atmosphere. In total, ozone makes up only 0.6 parts per million of the atmosphere.

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