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Q.

If 5% of the energy supplied to a bulb is irradiated as visible light, how many quanta are emitted per second by a 100 W lamp? Assume wavelength of visible light as 5.6x 10-5 cm.

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a

1.4×1019

b

3×103

c

1.4×10−19

d

3×104

answer is A.

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Detailed Solution

Energy radiated as visible light ,is 5100×100=5Js−1Let n be the number of photons emitted per second. Then, nhcλ=5∴ n=5λhc=5×5.6×10−76.62×10−343×108=1.4×1019
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