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A Carnot engine, having an efficiency of...

A Carnot engine, having an efficiency of `eta= 1/10` 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

A

`99 J`

B

`90 J`

C

`1 J`

D

`100 J`

Text Solution

Verified by Experts

The correct Answer is:
B
For cannot engine used as a refrigerator, `W=Q_2((T_1)/(T_2)-1)`
It is given `eta= (1)/(10) implies 1-(T_2)/(T_1)= (1)/(10)` implies `(T_2)/(T_1)= (9)/(10)`
So, `Q_2=90J` (As W= 10J)
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