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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

` 3 xx 10 ^( 16)`

B

` 9 xx 10^( 5 ) `

C

` 3 xx 10 ^(19)`

D

` 9 xx 10 ^(17) `

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The correct Answer is:
A
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MOTION-PHOTOELECTRIC EFFECT -EXERCISE - 3 SECTION -A (Previous Year Problems (NEET ))
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