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A carnot engine first works between 100^...

A carnot engine first works between `100^(@)C and 0^(@)C` and then between `0^(@)C and -100^(@)C`. What is the ratio of its efficiency in these two cases ?

A

0.51

B

0.63

C

0.73

D

0.85

Text Solution

Verified by Experts

The correct Answer is:
C
`eta_(1)=1-T_(2)/T_(1)=1-273/373=(373-273)/373=100/373`
`eta_(2)=1-(T'_(2))/(T'_(1))=1-173/273=100/273`
`thereforeeta_(1)/eta_(2)=100/373xx273/100=273/373=0.73`
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