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Q.

A given mass of a gas is compressed isothermally until its pressure is doubled.  It is then allowed to expand adiabatically until its original volume is restored and its pressure is then found to be 0.75 of its initial pressure.  The ratio of the specific heats of the gas is approximately:

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a

1.20

b

1.41

c

1.67

d

1.83

answer is B.

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Detailed Solution

P1v1=P2v2                 P1v1=2P2v2⇒v2=v12                 (2P)(v2)γ=(34P)vγ                         2γ=83⇒γ=log283                 γ=log28−log23                    ≃ 1.4
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