Q.

If mean wavelength of light radiated by 100 W lamp is 5000 Ao, then number of photons radiated per second are

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a

3×1023

b

2.5×1022

c

2.5×1020

d

5×1017

answer is C.

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Detailed Solution

P=nhcλt⇒nt=P.λhc=100×5000×10−106.6×10−34×3×108=2.50×1020
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If mean wavelength of light radiated by 100 W lamp is 5000 Ao, then number of photons radiated per second are