Answer to Question #121132 in Physics for Treasure

Question #121132
A pulsed laser has an average output power of 12W. Each pulse consists of light at wavelength 400nm and has 16ms duration. Compute the number of photons that are emitted in a single pulse?
1
Expert's answer
2020-06-09T13:18:26-0400

Electrical energy required for one 16-ms pulse is power times duration:


E=Pt.E=Pt.

The energy of a flux of N photons with wavelength λ each:

E=Nhcλ.E=\frac{Nhc}{\lambda}.

These energies are equal assuming zero energy losses. Express and calculate N:


N=Ptλhc=3.91017.N=\frac{Pt\lambda}{hc}=3.9\cdot10^{17}.

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