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NEET Sample Paper NEET Sample Test Paper-91

  • question_answer
    Monochromatic light of frequency \[6.0\times {{10}^{14}}Hz\] is produced by a laser. The power emitted is \[2\times {{10}^{-3}}W.\]The number of photons emitted, on the average, by the source per second is

    A) \[5\times {{10}^{16}}\]

    B)        \[5\times {{10}^{17}}\]

    C) \[5\times {{10}^{14}}\]

    D)        \[5\times {{10}^{15}}\]

    Correct Answer: D

    Solution :

    [d] Since p=nhv \[\Rightarrow \]\[n=\frac{p}{hv}=\frac{2\times {{10}^{-3}}}{6.6\times {{10}^{-34}}\times 6\times {{10}^{14}}}\] \[=5\times {{10}^{15}}\]


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