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

  • question_answer
    The dependence of the short wavelength limit \[{{\lambda }_{\min }}\] on the accelerating potential V is represented by the curve of figure

    A)            A

    B)            B

    C)            C

    D)            None of these

    Correct Answer: A

    Solution :

                       \[{{\lambda }_{\min }}=\frac{hc}{eV}\] Þ \[\log .{{\lambda }_{\min }}=\log \frac{hc}{e}-\log V\]                    Þ \[\log {{\lambda }_{\min }}=-\log V+\log \frac{hc}{e}\]            This is the equation of straight line having slope (?1) and intercept \[\log \frac{hc}{e}\] on \[+{{\log }_{e}}{{\lambda }_{\min }}\] axis.


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