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Question

Monochromatic light of wave length 667 nm is produced by a helium neon laser. The power emitted is 9mW. The number of photons arriving per second on the average at a target irradiated by this beam is

A
3×1016
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B
3×1019
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C
9×1015
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D
9×1017
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Solution

The correct option is A 3×1016
Wavelength of light λ=667 nm
Energy of incident photon E=hcλ
E=6.626×1034×3×108667×109=3×1019 J
Power of light P=9mW=0.009 W
So, number of photons per second NPE=0.0093×1019=3×1016 photons/ second

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