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Consider photons with a wavelength of 620 nm entering a photomultiplier tube.

If the power entering the photomultiplier is $4.50\times{10}^{-17}\text{ W}$, how many photons have entered the photomultiplier tube after 5.0 seconds?


  • $h=6.626\times{10}^{-34}\text{ J s}$
  • $1\text{ W}=1\text{ J/s}$
  • $c=3.00\times{10}^{8}\text{ m/s}$
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