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    Question

    In the atmosphere ultraviolet rays are absorbed by

    –
    A Oxygen Correct Answer Incorrect Answer
    B Nitrogen Correct Answer Incorrect Answer
    C Ozone Correct Answer Incorrect Answer
    D Helium Correct Answer Incorrect Answer

    Solution

    Most of the ultraviolet radiation in sunlight is absorbed by oxygen in Earth's atmosphere, which forms the ozone layer of the lower stratosphere. UV light is found in sunlight (where it constitutes about 10% of the energy in vacuum) and is emitted by electric arcs and specialized lights such as black lights. It can cause chemical reactions, and causes many substances to glow or fluoresce. Most ultraviolet is classified as non-ionizing radiation.

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