2. Solved Papers
  3. BCECE Medical

BCECE Medical BCECE Medical Solved Papers-2009

  • question_answer
    No photoelectrons are emitted from a metal if the wavelength of the light exceeds 600 nm. The work function of the metal is approximately equal to

    A)  \[3\times {{10}^{-16}}J\]

    B)  \[3\times {{10}^{-19}}J\]

    C)  \[3\times {{10}^{-20}}J\]     

    D)  \[3\times {{10}^{-22}}J\]

    Correct Answer: B

    Solution :

    The work function                 \[W=\frac{hc}{\lambda }\]                 \[=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{600\times {{10}^{-9}}}\] \[W=3\times {{10}^{-19}}J\]      (approximately)


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