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Q.

In a Carnot engine, when T2 = 00C and T1 = + 2000C its efficiency is η1 and when T1 = 00C and T2 = 2000C, Its efficiency is η2, then what is η1/η2

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a

0.577

b

0.733

c

0.638

d

Cannot be calculated

answer is A.

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Detailed Solution

η=1−T2T1=T1−T2T1⇒η1=(473−273)473=200473 and η2=273−73273=200273So required ratio η1η2=273473=0.577
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