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Monochromatic light of frequency 6 xx 10...

Monochromatic light of frequency `6 xx 10^(14)`Hz is produced by a laser. The power emitted is `2.0 xx 10^(-3) W`. How many photons per second on an average are emitted by the source ?

A

`5xx10^14`

B

`5xx10^15`

C

`5xx10^16`

D

`5xx10^17`

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