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Monochromatic light of frequency 6.0 xx ...

Monochromatic light of frequency `6.0 xx 10^(14) Hz` is produced by a laser. The power emitted is `2 xx 10^(-3)` w. The number of photons emitted, on the average, by the sources per second is

A

`5 xx 10^(16)`

B

`5 xx 10^(17)`

C

`5 xx 10^(14)`

D

`5 xx 10^(15)`

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