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Question

A bulb emits light of wave length 396 nm. The bulb is rated as 100 watt and 10% of the energy is emitted as light. How many photons are emitted by bulb per second?


A
1018
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B
2×1019
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C
2×1018
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D
1019
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Solution

The correct option is B 2×1019

Energy of the bulb = 100 watt
= 100 J per second
Percentage of energy emitted as light = 10%
Energy emitted as light per second = 10 J
Energy of the photon = hν
=6.626×1034×3×1083960×1010
=0.5×1018 J
Number of photons = total energy emitted per secondenergy of one photon=100.5×1018
= 2×1019


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