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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 `10J`, the amount of energy absorbed from the reservior at lower temperature is

A

`99J`

B

`90J`

C

`1J`

D

`100J`

Text Solution

Verified by Experts

The correct Answer is:
B
For carnot engine using as refrigerator.
`W=Q_(2)((T_(1))/(T_(2))-1)`
It is given `ea=1/10implieseta=1(T_(2))/(T_(1))`
`implies(T_(2))/(T_(1))=9/10`
So` Q_(2)=90J` (as `W=10J`)
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