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The number of photons emitted per second...

The number of photons emitted per second by a 60 W source of monochromatic light of wavelength 663 nm is (h=`6.63xx10^(-34) Js)`

A

`4xx10^(-20)`

B

`1.54xx10^20`

C

`3xx10^(-20)`

D

`1xx10^(-20)`

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The correct Answer is:
D
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