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How many photons are emitted by a laser ...

How many photons are emitted by a laser source of `5 xx 10^(-3)` W operating at 632.2 nm in 2 second `(h = 6.63 xx 10^(-34)Js)`?

A

`3.2 xx10^(16)`

B

`1.6xx10^(16)`

C

`4xx10^(16)`

D

None of these

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The correct Answer is:
A
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