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A carnot engine having an efficiency of ...

A carnot engine having an efficiency of `1/4` is being used as a refrigerator. If the work done on the refrigerator is 5 J, the amount of heat absorbed from the reservoir at lower temperature is:

A

1J

B

100J

C

99 J

D

90J

Text Solution

Verified by Experts

The correct Answer is:
D
For carnot engine using as refrigerator
`W=Q_2(T_1/(T_2)-1)" "... (i) `
`implies eta=1-T_2/T_1implies1/10 =1-T_2/T_1" "[ :. eta=1//10]`
`implies T_(2)/(T_1) =9/10" "(ii)`
By eq. (i) and (ii)
`Q_2 = 90 J ["as" W= =10J]`
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