NEET Physics EM Waves NEET PYQ-EM Waves

  • question_answer
    Ozone layer blocks the radiations of wave length:                                                    [AIPMT 1999]

    A)  less than \[3\times {{10}^{-7}}\,m\]     

    B)  equal to \[3\times {{10}^{-7}}\,m\]

    C)  more than \[3\times {{10}^{-7}}\,m\]   

    D)  all of the above

    Correct Answer: A

    Solution :

    Ozone layer extends from 30 km to nearly 50 km above the earth's surface in ozone sphere. This layer absorbs the major part of ultraviolet radiations coming from the sun and does not allow them to reach the earth's surface.
    The range of ultraviolet radiations is \[\text{100}\,\overset{\text{o}}{\mathop{\text{A}}}\,\] to\[\text{4000}\,\overset{\text{o}}{\mathop{\text{A}}}\,\]. Thus, it blocks the radiations of wavelength less than \[3\times {{10}^{-7}}\,m\] (or \[\text{3000}\,\overset{\text{o}}{\mathop{\text{A}}}\,\]).

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