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NEET Sample Paper NEET Sample Test Paper-46

  • question_answer
    Light falling on metallic surface of work function 2eV is given by \[B\text{ }=\text{ }100\text{ }\left[ sin\text{ }\left( 5\text{ }\times \text{ }{{10}^{15}} \right)\text{ }t\text{ }+\text{ }cos\text{ }\left( 8\text{ }\times \text{ }{{10}^{15}} \right)t \right]\]Then maximum kinetic energy of the photoelectrons is-

    A) 1.6 Ev

    B)                    2.4 eV

    C) 2.8eV   

    D)        3.38eV

    Correct Answer: D

    Solution :

    \[~{{K}_{max}}=hf\,\,-\,\,\phi \] \[\omega =2\pi f=8-{{10}^{15}}\]


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