Electromagnetic radiation and spectra

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Question

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

Moderate

Solution

$\begin{array}{l} Total energy = h \cdot v \cdot N_{A} \\ = 6 .602 \times 10^{- 34} \times 250 \times 6 .023 \times 10^{23} \\ = 0 .99 \times 10^{- 7} J \approx 1 erg \end{array}$

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