JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Topic Test - Photo Electric Effect, X-Rays & Matter Waves

  • question_answer
    The momentum of a photon is \[2\times {{10}^{-16}}\]gm-cm/sec. Its energy is

    A) \[0.61\times {{10}^{-26}}erg\]

    B) \[2.0\times {{10}^{-26}}erg\]

    C) \[6\times {{10}^{-6}}erg\]

    D) \[6\times {{10}^{-8}}erg\]

    Correct Answer: C

    Solution :

    [c] \[p=\frac{E}{c}\,\Rightarrow \,\,E=p\times c=2\times {{10}^{-16}}\times (3\times {{10}^{10}})\]\[=6\times {{10}^{-6}}erg.\]

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