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Question

A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number of photons emitted per second by bulb :

A
2×1016
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B
2×1018
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C
2.01×1020
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D
2×1022
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Solution

The correct option is C 2.01×1020
E=100W

λ=400nm

=400×109m

E=nhcλ

n=Eλhc

n=100×400×10919.878×1026

n=2.01×1020

Hence, option (C) is correct answer.

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