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A monoatomic gas at a pressure P, having a volume V expands isothermally to a volume 2V and then adiabatically to a volume 16 V. The final pressure of the gas is (Take γ = 5/3)

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a
64 P
b
32 P
c
P / 64
d
16 P

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detailed solution

Correct option is C

First, isothermal expansion PV=P′(2V)(For isothermal process, PV = constant)P′=P2Then, adiabatic expansionP′(2V)γ=Pf(16V)γ (For adiabatic process, PVγ= constant )P2(2V)5/3=Pf(16V)5/3Pf=P22V16V5/3=P2185/3=P21235/3=P2125=P64


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