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Dear Shambhavi,
Energy given to Iodine molecule = hc/λ
= 6.62 × 10^-34 × 3 × 10^8 ÷ 4500× 10^-10
=4.417 × 10^-19 J
also, energy used for braking up iodine molecule = 240 × 10^3 ÷ 6.023 × 10 ^23 =3.984× 10^-19 J
(bcoz B.E. is given in per mole and we have to find out per molecule)
Energy used in imperting Kinetic energy to two I atoms = [4.417 -3.984] × 10 ^-19 J
so K.E per iodine atom = [4.417-3.984/2] × 10^-19
= .216 × 10^-19 J
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