A carnot engine having an efficiency ofth of heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is -
(a) 1 J
(b) 90 J
(c) 99 J
(d0 100 J
(b) Consider schematic diagram for a carnot engine as shown below.
In case of engine,
when this engine is reversed, it takes in work W and heat from cold reservoir and rejects 100 J of heat to hot reservoir.