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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 ^(16)`

B

`9 xx 10^(15)`

C

`3 xx 10^(19)`

D

`9 xx 10^(17)`

Text Solution

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The correct Answer is:
A
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