Photoelectrons are emitted from a metal surface for frequencies $\nu_1$ and $\nu_2$. If the ratio of the maximum kinetic energy of the emitted photoelectrons is $1 : k$,then the threshold frequency of the metal surface is:

  • A
    $\frac{\nu_1 - \nu_2}{k - 1}$
  • B
    $\frac{k\nu_1 - \nu_2}{k - 1}$
  • C
    $\frac{k\nu_2 - \nu_1}{k - 1}$
  • D
    $\frac{\nu_2 - \nu_1}{k}$

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