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NEET Sample Paper NEET Sample Test Paper-57

  • question_answer
    For photoelectric emission from certain metal, the cut off frequency is d. If radiation of frequency \[2\upsilon \] impinges on the metal plate the maximum possible velocity of emitted electron will be:

    A) \[\sqrt{\frac{hv}{2m}}\]            

    B) \[\sqrt{\frac{hv}{m}}\]

    C) \[\sqrt{\frac{2hv}{m}}\]            

    D) \[\sqrt{\frac{hv}{m}}\]

    Correct Answer: C

    Solution :

    [c] Apply Einstein equation of photoelectric effect General expression \[hv=hv+\frac{1}{2}m{{v}^{2}}\] \[h(2v)=hv+\frac{1}{2}m{{v}^{2}}\] \[\frac{1}{2}m{{v}^{2}}=2hv-hv\] \[{{v}^{2}}=\frac{2}{m}hv\] \[v\sqrt{\frac{2hv}{m}}\]


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