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JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Graphical Questions

  • question_answer
    In an experiment on photoelectric effect the frequency f of the incident light is plotted against the stopping potential \[{{V}_{0}}\]. The work function of the photoelectric surface is given by (e is electronic charge)  [CPMT 1987]

    A)            OB \[\times \]e in eV

    B)            OB in volt

    C)            OA in eV

    D)            The slope of the line AB

    Correct Answer: A

    Solution :

                       Using Einstein?s equation, \[{{V}_{0}}=\left( \frac{h}{e} \right)\,\nu -\frac{{{W}_{0}}}{e}\]                               Comparing this equation with \[y=mx+c\]                    We get intercept on ? V0 axis \[=\frac{{{W}_{0}}}{e}\]                    Þ \[OB=\frac{{{W}_{0}}}{e}\] Þ \[{{W}_{0}}=OB\times e\]


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