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Question

Calculate energy of one mole of photon of radiations whose frequency is 5×1014Hz.

Solution
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Energy of one photon is given by the expression E=hv

E=(6.636×1034Js1×5×1014s1)
=33.18×1020J
One mole of photon =6.023×1023 photons
Therefore, Energy of one mole of photon =(6.023×1023×33.18×1020J)=199.84×103 J
Energy of one mole of photon =199.84 kJ

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