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Monochromatic light of frequency 6.0 xx ...

Monochromatic light of frequency `6.0 xx 10^(14)` Hz is produced by a laser. The power emitted is `2 xx 10^(-3)` W. The number of photons emitted, on the average, by the source per second is

Text Solution

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Power = nhv
where n = number of photons per second
`=2.0xx10^(-3)=nxx6.6xx10^(-34)xx6xx10^14`
`n=(2.0xx10^(-3))/(6.6xx10^(-34)xx6xx10^14)`
`=(2.0xx10^(-3))/(39.6xx10^(-20))`
= 5 x 10 photons per second
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