The variation of stopping potential $V_{0}$ with frequency $\nu$ of incident radiation for a given photosensitive material is a straight line [frequency $\nu$ of incident radiation is greater than threshold frequency $\nu_{0}$]. The slope of this line is . . . . . . .

  • A
    $\frac{h}{\nu}$
  • B
    $\frac{\phi_{0}}{h}$
  • C
    $\frac{h}{e}$
  • D
    $\frac{e}{V_{0}}$

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