Question

Carnot engine works as a refrigerator between 250 kelvin and 300 kelvin it receives 500 calorie heat from the reservoir at lower temperature amount of work done in each cycle to operate refrigerator

Answer 1

Q2/Q1 = T2/T1 = 250/300 = 5/6

Q2 = 500  cal 

Q1 = 600 cal

W = Q1-Q2 = 100 cal