How many photons are emitted per second by a 5 mW laser source operating at 632.8 nm?

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1.6×1016

1.6×1013

1.6×1010

1.6×103

answer is A.

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Detailed Solution

E=hcλ=6.6×10−34×3×108632.8×10−9J Number of photons per second, n=PE⇒ n=5×10−33.14×10−19=1.6×1016