Q.

1 mole of photons, each of frequency 250 sec-1 would have approximately a total energy (in erg):

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Detailed Solution

Total energy =h⋅v⋅NA=6.602×10−34×250×6.023×1023=0.99×10−7J≈1erg
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1 mole of photons, each of frequency 250 sec-1 would have approximately a total energy (in erg):