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Question

A bulb emits light having λ=4500 A. The bulb is rated as 150 watt and 8% of the energy is emitted as light. How many photons are emitted by the bulb per second?

A
2.72×1011
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B
5.44×1011
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C
2.72×1019
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D
5.44×1019
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Solution

The correct option is C 2.72×1019
Given,
the power of the bulb =150 watt=150 J s1
So, the energy released by the bulb in the form of light per second =150×8100 J=12 J
Again, the wavelength of emitted light, λ=4500 A
We know,
E=nhv=n×hcλ=Energy emitted by bulb in the form of light
Thus,
n×hc4500×1010=12 J

n×6.62×1034×3×1084500×1010=12 J

n=2.72×1019

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