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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 second by a 100 W lamp? Assume wave length of visible light as 5.6  × 10−5 cm?

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a

1.4 × 1019

b

2 × 1014

c

1.32 × 1016

d

4.2 × 1015

answer is A.

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Detailed Solution

hν=hcλ=124205600ev=3.5485×10−19 Joule∴Number of photons emitted=100×0.053.5485×10−19=1.4×10−19
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