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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 the bulb.

A

B

C

D

Medium

Solution

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Correct option is
C

Power of the bulb = watt =

Energy of one photon is

where,

Given

By putting the values, we get



Number of photons emitted in 1 sec energy of one photon = power



photons per sec

So, option is correct

Video Explanation

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