When light of wavelength $\lambda$ is incident on a photosensitive surface,photons of power $P$ are emitted. The number of photons $n$ emitted in $t$ seconds is (where $h$ = Planck's constant,$c$ = velocity of light in vacuum).
- A$\frac{h c}{P \lambda t}$
- B$\frac{P \lambda t}{h c}$
- C$\frac{P \lambda}{h t c}$
- D$\frac{h P}{\lambda t c}$
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