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10. Calculate the energy of one mole quanta of radiation whosefrequency is 5 x 1010 sec-1.

Answer»

Energy of one photon is given by the expression E = hVwhere, h = PlancKs constant = 6.636 x 10^-34J s-1V= Frequency of radiation = 5x 10^10Hz= 5 x 10^10s-1.E= (6.636 x 1034J s-1 x 5 x 10^10s-1)= 33.18 x 10^-24JOne mole of photon = 6.023 x 10^23photonsTherefore, Energy of one mole of photon = (6.023 x 10^23x 33.18 x 10^-24J) = 199.84 x 10-1JEnergy of one mole of photon = 199.84 kJ



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