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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

`9 xx 10^(17)`

B

`3 xx 10^(16)`

C

`9 xx 10^(15)`

D

`3 xx 10^(19)`

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The correct Answer is:
B
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