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Question

A bulb emits light of wavelength 198 nm. The bulb is rated as 100 watt and 10 % of the energy is emitted as light. The number of photons emitted per second is 10x. Take h=6.6×1034. The value of x is


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Solution

Energy of the bulb=100 watt=100J per second
Percentage of energy emitted as light = 10%
Energy emitted as light per second = 10 J
Energy of the photon = hν
=6.6×1034×3×1081980×1010
=1×1018 J
Number of photons =Total energy emitted per secondEnergy of one photon
=101018 = 1019
Hence, the value of x=19


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