a) In Naɑ the equilibrium distance r, between ions is 2.81 Aº. Madelung constant a = 1.748 and n = 9 (in Vrepulsive B . Calculate the contributions per ions to the cohesive energy. b) If ionization energy of Na = 5.14 eV and electron affinity of Cl is -3.61 eV, calculate the electron transfer energy and the total cohesive energy per atom.

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A: IR spectroscopy is branch of chemistry in which we deal with interaction of radiation with matter.

Photochemistry

Photochemistry is the part of chemistry that studies the various mechanisms of reactions that are triggered by the presence of light energy. It also helps to study the changes involved in a molecule that can undergo the absorption of radiation.