Rishi was discussing about science to his elder sister Shri in the dining room and so their mother came who was cooking in the kitchen shouted at them. All of a sudden, he saw his mother sweating and feeling hot inside the kitchen. Rishi opened the door of the refrigerator thinking that this might relieve her from heat. But, his sister immediately rushed towards him and closed the door. She then made him understand that opening of refrigerator would increase the temperature of the room. a) What values of Shri do you appreciate? b) Why a room cannot be cooled by opening the door of refrigerator? c) If the temperature inside an ideal refrigerator is 285 K, then how much heat is delivered to room for every one joule of work done on working substance when room temperature is 320 K?
a) She is sensible and has scientific knowledge. b) This is because a refrigerator rejects heat from inside to the air in the room and so the room temperature increases gradually. c) By substituting values in 2 2 1 2 Q T β = = W T - T , we get Q1 = 6.9 J and Q2 = 7.9 J
