Plz solve this problem Share with your friends Share 0 Ved Prakash Lakhera answered this Let the distance between plate -1 and plate-3 be x then the distance between plate-1 and plate-2 is 3x. Now from the eqn of transfer of heat energy per unit area of the plate per second is given by, Q α T1-T2dTherefore the transfer of heat from plate one to plate 3 is given by, Q13 α T1-T2xand between plate 1 to plate 2 is Q12 α T1-T23x Thus the ratio of Q13 to Q12=13Therefore efficiency η = Q13 Q12=13Therefore correct answer is option b 13. 0 View Full Answer