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BVP Medical BVP Medical Solved Paper-2010

  • question_answer
    When ultraviolet light of wavelength 100 nmis incident upon silver plate, a potential of 7.7 V is required to stop the photoelectronsfrom reaching the collector plate. How muchpotential will be required to stop thephotoelectrons when light of wavelength 200 nm is incident upon silver?

    A)  1.5V                                     

    B)  3.85V

    C)  2.35V                                   

    D)  15.4V

    Correct Answer: A

    Solution :

                    \[\left[ M{{L}^{2}}{{T}^{-2}}{{A}^{-2}} \right]\] \[\left[ M{{L}^{2}}{{T}^{-3}}{{A}^{-2}} \right]\]   \[\frac{3}{2}m{{r}^{2}}\] Similarly,                 \[\frac{m{{r}^{2}}}{2}\] Now    \[\frac{3}{8}m{{r}^{2}}\] and    \[\frac{mx}{{{(m+1)}^{2}}}\] Hence,    \[\frac{mx}{{{(m-1)}^{2}}}\] and        \[\frac{{{(m+1)}^{2}}}{m}x\] Solving, we get \[\frac{{{(m-1)}^{2}}}{m}x\]


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