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NEET Sample Paper NEET Sample Test Paper-23

  • question_answer
    The graph shows the variation of stopping potential \[{{V}_{S}}\]with the frequency v of the incident light in a photoelectric experiment. From the graph it can be concluded that (e is electronic charge)

    A)  the work function of the mental is eb.

    B)  the work function of the metal is ea.

    C)  the value of Planck's constant is equal to \[\frac{2eb}{a}\]

    D)  the value of Planck's constant is equal to \[\frac{ea}{b}\]

    Correct Answer: A

    Solution :

    The relation between the stopping potential and the frequency is \[hv=e{{V}_{s}}+\phi \]or \[{{V}_{S}}=\frac{h}{e}v-\frac{\phi }{e}\] From the graph y intercept = b \[\therefore \]    \[b=\frac{\phi }{e}\Rightarrow \phi =be\] Hence, the correction option is [a].


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