2. Solved Papers
  3. MGIMS WARDHA

MGIMS WARDHA MGIMS WARDHA Solved Paper-2013

  • question_answer
    Light of wavelength 488 nm is produced by organ laser, which is used in the photoelectric effect. When light from this spectral line is incident on the emitter, the stopping (cut-off) potential of photoelectron is 0.38 V. Find the work function of the material from which the emitter is made.

    A)  1.25eV                

    B)  2.17eV

    C)  4.07eV                

    D)  3.57eV

    Correct Answer: B

    Solution :

                    \[KE=e{{V}_{0}}=\frac{hc}{\lambda }-Q\] \[1.6\times {{10}^{-19}}\times 0.38=\frac{6.63\times {{10}^{-34}}\times 3\times {{10}^{8}}}{448\times {{10}^{-9}}}-\phi \]                 \[\phi =2.17eV\]


You need to login to perform this action.
You will be redirected in 3 sec spinner