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helium-Neon laser emit monochromatic lig...

helium-Neon laser emit monochromatic light of 667 nm abd produce power of 9 kW.number of photon reaching to target every second will be………

A

`3xx10^(16)`

B

`9xx10^(15)`

C

`3xx10^(22)`

D

`3xx10^(17)`

Text Solution

Verified by Experts

The correct Answer is:
A
`lambda=667xx10^(9)m,P=9xx10^(-3)W`
`P=(Nhc)/(lambda)`,N=no.of photon emitted every second
`N=(9xx10^(-3)xx667xx10^(-9))/(6.6xx10^(-34)xx3xx10^(8))`
`=(9xx6.67xx10^(-10))/(3xx6.6xx10^(-26))~~3xx10^(16)S`
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