Monochromatic light of frequency of 6×1014Hz is produced by a laser. Power emitted is 2×10−3W. Approximately how many photons per second are emitted by the source?
A
5×1013
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B
5×1014
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C
5×1015
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D
5×1016
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Solution
The correct option is C5×1015 Power emitted is given by P=nhν
Therefore, no. of photons emitted per second n=Phν=2×10−36.6×10−34×6×1014 =5×1015