Thermodynamics Question 136

Question: If the ratio of specific heat of a gas at constant pressure to that at constant volume is γ , the change in internal energy of a mass of gas, when the volume changes from V to 2V constant pressure p, is

[CBSE PMT 1998]

Options:

A) R/(γ−1)

B) pV

C) pV/(γ−1)

D) γpV/(γ−1)

Show Answer

Answer:

Correct Answer: C

Solution:

ΔU=μCVΔT=n(Rγ−1)ΔT

⇒ΔU=PΔV(γ−1)=P(2V−V)γ−1=PV(γ−1)

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