Question

idodine molecules dissociates into atoms after absorbing light of 4500 ANGSTROM .if one quantum of radiation is absorbed by each molecules ,calculate the kinetic energy of iodine atoms .

Answer 1

Energy is conserved

Energy of the photon is \[E_\gamma=h\nu=\frac{hc}{\lambda}\]
Combined Kinetic Energy of Both iodine atoms \[KE_{I_2}=\frac{mv^2}{2}\]
Kinetic energy of each atom\[KE_I=\frac{mv^2}{4}\]