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NEET Sample Paper NEET Sample Test Paper-29

  • question_answer
    Work function of a metal surface is\[\phi =~1.5\,eV\]. If a light of wavelength \[5000\overset{o}{\mathop{A}}\,\]falls on it then the maximum K.E. of ejected electron will be

    A)  \[1.2\,eV\]                  

    B)  \[0.98\,eV\]

    C)  \[0.45\text{ }eV\]                   

    D)  \[0\text{ }eV\]

    Correct Answer: B

    Solution :

    \[K.{{E}_{\max }}=\frac{hc}{\lambda }-\phi \,\,=\frac{12400\,eV{{A}^{o}}}{5000{{A}^{o}}}-1.5\,eV\] \[=(2.48-1.5)\,eV\]    \[=0.98\,eV\]


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