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^(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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