A Carnot engine having an efficiency of as 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 :
1 J
90 J
99 J
100 J
As we learnt in
Coefficient of performance (beta) -
- wherein
For a perfect refrigerator
Efficiency of a carnot cycle -
are in kelvin
- wherein
Source temperature
Sink Temperature
For a carnot cycle
= Coefficient of performance
= Efficiency of carnot engine
Option 1)
1 J
This option is incorrect.
Option 2)
90 J
This option is correct.
Option 3)
99 J
This option is incorrect.
Option 4)
100 J
This option is incorrect.