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CMC Medical CMC-Medical Ludhiana Solved Paper-2008

  • question_answer
    Light of wavelength 4000\[\overset{\text{o}}{\mathop{\text{A}}}\,\] is incident on a sodium surface for which the threshold wavelength of photoelectron is 5420\[\overset{\text{o}}{\mathop{\text{A}}}\,\]. The work function of sodium is

    A)  4.58 eV               

    B)  2.28 eV

    C)  1.14eV                                

    D)  0.57 eV

    Correct Answer: B

    Solution :

                    \[{{W}_{0}}=\frac{12375}{{{\lambda }_{0}}(\overset{\text{o}}{\mathop{\text{A}}}\,)}\] \[=\frac{12375}{5420}=2.28\,\,eV\]


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