A Carnot engine, having an efficiency of 
as heat engine, is used as a refrigerator. If the work done on the system is 
, the amount of energy absorbed from the reservoir at lower temperature is
Text Solution
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For Carnot engine using as refrigerator
Work done on engine is given by
where 
is heat rejected to the reservoir at higher temperature and 
is the heat absorbed from the reservoir at lower temperature.
It is given 
We are given, 
Therefore, from equations (1) and (2),
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