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Monochromatic light of wavelenght 667nm ...

Monochromatic light of wavelenght `667nm` is produced by a helium neon laser. The power emitted is `9mW`. The number of photons arriving per seconid on the average at a target irradiated by this beam

A

`3 xx 10^(19)`

B

`9xx 10^(17)`

C

`3 xx 10^(16)`

D

`9 xx 10^(15)`

Text Solution

Verified by Experts

The correct Answer is:
C
No. of photon ` =(E)/(hc//lambda)`
`=(9xx10^(-3)xx 6.67xx10^(-7))/(6.6xx10^(-34)xx 3xx10^(8))`
`=3 xx 10^(16)`
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