If the work function of a metal is 'Φ' and the frequency of the incident light is 'v', there is no emission of photoelectron if

• A

  $\mathrm{v}<\frac{\mathrm{\varphi }}{\mathrm{h}}$

• B

  $\mathrm{v}=\frac{\mathrm{\varphi }}{\mathrm{h}}$

• C

  $\mathrm{v}>\frac{\mathrm{\varphi }}{\mathrm{h}}$

• D

  $\mathrm{v}\ge \frac{\mathrm{\varphi }}{\mathrm{h}}$