A plane wall, initially at absolute temperature TI. , is suddenly exposed to radiation on each surface from a source at Too (a) State the...

Please explain steps and assumptions for clarity. Thanks

A plane wall, initially at absolute temperature TI. , is suddenly exposed to radiation oneach surface from a source at Too (a) State the differential equation and boundary and initial conditions for thisproblem. (b) State whether the method of separation of variables will work Explainyour answer.