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

P=nhcλt⇒nt=P.λhc=100×5000×10−106.6×10−34×3×108≃2.5×1020

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

P=nhcλt⇒nt=P.λhc=100×5000×10−106.6×10−34×3×108≃2.5×1020

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If mean wavelength of light radiated by 100 W lamp is 5000 $\overset{o}{A}$ , then number of photons radiated per second are

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$2 .5 \times 10^{20}$

$3 \times 10^{23}$

$2 .5 \times 10^{22}$

$5 \times 10^{17}$

answer is C.

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Detailed Solution

$P = \frac{nhc}{λt} \Rightarrow \frac{n}{t} = \frac{P . λ}{hc} = \frac{100 \times 5000 \times 10^{- 10}}{6 .6 \times 10^{- 34} \times 3 \times 10^{8}} ≃ 2 .5 \times 10^{20}$

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