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NEET Sample Paper NEET Sample Test Paper-44

  • question_answer
    The threshold wavelength for a metal having work function\[{{\operatorname{W}}_{o}} is {{\lambda }_{o}}\]. What is the threshold wavelength for a metal whose work function\[{}^{{{\operatorname{W}}_{o}}}/{}_{2}\]?

    A) \[4{{\lambda }_{\operatorname{o}}}\]     

    B)               \[2{{\lambda }_{\operatorname{o}}}\]    

    C) \[\frac{{{\lambda }_{\operatorname{o}}}}{2}\]                          

    D) \[\frac{{{\lambda }_{\operatorname{o}}}}{4}\]

    Correct Answer: B

    Solution :

    \[\operatorname{Work} function {{W}_{o}}=\frac{hc}{{{\lambda }_{\operatorname{o}}}}\]         .....(1) \[If\,\,\operatorname{Work} function \frac{{{W}_{o}}}{2}=\frac{hc}{{{\lambda }_{\operatorname{o}}}}\]            ..... (2) by (1) and (2) \[\operatorname{We} get {{\lambda }_{1}}=2{{\lambda }_{o}}\]


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