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1 mole of photon, each of frequency $2500 \mathrm{~S}^{-1}$, would have approximately a total energy of:
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$1 \mathrm{erg}$
Total Energy $=\mathrm{Nhv}=6.022 \times 10^{23} \times 6.626 \times 10^{-34} \mathrm{~J} . \mathrm{S} . \times 2500 \mathrm{~s}^{-1}=9.9 \mathrm{erg} \approx 10 \mathrm{erg}$ In (A) option, it should be 10 erg instead of $1 \mathrm{erg}$.
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