13. a solid metallic cube of heat capacity sis at temperature 300 k. it is brought in contact wiu 300 k. it is brought in contact with a reservoir at 600 a. if

13. A solid metallic cube of heat capacity Sis at temperature 300 K. It is brought in contact wiu 300 K. It is brought in contact with a reservoir at 600 A. If the heat transfer takes place only between the reversOir and the cube, the entropy change of tne universe after reaching the thermal equilibrium 1S hetween thne (a) 0.69S (c) 0.27S (b) 0.54.S (d) 0.19S JAM PH-20141