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Question

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

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

The correct option is D 3×1016
No.ofphotons=E(hc/λ)
=9×103×6.67×1076.6×1034×3×108

=3×1016



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