The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600 nm, when it delivers the power of 3.3 10 -3 watt will be (h = 6.6 10 -34 J s )

1. A. 10 17
2. B. 10 16
3. C. 10 15
4. D. 10 18

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