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Monochromatic light of frequency 6.0xx10...

Monochromatic light of frequency `6.0xx10^(14)Hz` is produced by a laser. The power emitted is `2.0xx10^-3W`, (a) What is the energy of a photon in the light beam? (b) How many photons per second, on the average, are emitted by the source? Given `h=6.63xx10^(-34) Js`

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The correct Answer is:
4
(1) `E=hv=(hc)/(lambda)=3.98xx10^(-19)j`
(2) `N-(p)/(hv)"per sec"`
`N-5.0xx10^(15)` photons per second.
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