A bulb emits light of λ=4500oA. 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
27.2×1018
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B
2.72×1016
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C
2.72×1018
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D
0.272×1018
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Solution
The correct option is A27.2×1018 Energy of one photon =E=hv=hcv 6.626×10−34×3×1084500×10−10=4.42×10−19J Energy emitted by bulb =150×8100J ∴n×4.42×10−19=150×8100 ∴n=27.2×1018 photons