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

  • question_answer
    A photon of energy 8 eV is incident on metal surface of threshold frequency \[1.6\times {{10}^{15}}Hz.\] The maximum kinetic energy of the photoelectrons emitted (in eV) (Take \[h=6\times {{10}^{-34}}Js)\].   

    A) 1.6

    B) 6

    C) 2

    D) 1.2

    Correct Answer: A

    Solution :

    [a] \[K.E.=h\nu -h{{\nu }_{0}}\]\[=8\ eV-\left( \frac{6\times {{10}^{-34}}\times 1.6\times {{10}^{15}}}{1.6\times {{10}^{-19}}}eV \right)\] = \[8\ eV-6\ eV=2\ eV\]

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