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Q.

If 5% of the energy supplied to a bulb is radiated as visible light, how many quanta are emitted per sec by a 100 watt lamp ? Assume wavelength of visible light as 5.6 x10 -5 cm

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a

1.4 x 1019

b

2.0 x 10-4

c

1.4 x 10-19

d

2.0x104

answer is A.

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Detailed Solution

Energy radiated as visible light =5100×100=5J/sLet n be the number of photons emitted per second. Thennhv=nhcλ=5 n=5λhc =5×5⋅6×10−76⋅2×10−343×108=1⋅4×1019

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