Monochromatic light of frequency 6.0 10 14 Hz is produced by a laser. The power emitted is 2 10 -3 W. The number of photons emitted, on the average, by the source per second is

1. A. 5 10 16
2. B. 5 10 17
3. C. 5 10 14
4. D. 5 10 15

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