BITSAT 2021 Paper

Section: Physics

Question : 29 of 150

Marks: +1, -0

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

3×1016
9×1015
3×1019
9×1017

Validate

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