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Monochromatic light of wavelength 667 nm...

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

A

`3xx10^(19)`

B

`3xx10^(16)`

C

`9xx10^(17)`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
B
`n= 5xx10^(24) xx667xx10^(-9) xx9cc10^(-3) `
`=3x10^(-16) `
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