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Question

An ideal gas is expanding such that PT3=constant. The Molar Specific heat capacity of the gas is

A
11R2
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B
7R2
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C
5R2
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D
9R2
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Solution

The correct option is A 11R2
Given PT3=constant
From ideal gas equation, PVT=constant
Hence for given ideal gas, P4V3=constantPV3/4=constant
For polytropic process PVx=constant,
heat capacity C=R1x+Rγ1
Here x=34,γ=53C=4R+3R2=11R2

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