Question

Monochromatic light of frequency `5.0xx10^(14)Hz` is produced by a laser. The power emitted is `3.0xx10^(-3)W`. Estimate the number of photons emitted per second on an avearge by the source. Given `h=6.62xx10^(-34)Js`

Answer 1

Correct Answer - `9.1xx10^(15)`
No. of photons emitted per second
`n=P/(hv)=(3.0xx10^(-3))/(6.63xx10^(-34)xx5.0xx10^(14))`
`=9.1xx10^(15)"photons"//s`