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Question: Answered & Verified by Expert
The volume of an ideal gas is doubled in an isothermal process. Then, which of the following is true?
PhysicsThermodynamicsJIPMERJIPMER 2016
Options:
  • A Work done by the gas is positive
  • B Work done by the gas is negative
  • C Internal energy of the system decreases
  • D Internal energy of the system increases
Solution:
1032 Upvotes Verified Answer
The correct answer is: Work done by the gas is positive
For isothermal process,
$d U=0$
$\begin{aligned} & \text { Work done }=d W=p\left(V_2-V_1\right) \\ & \therefore \quad d W=+p V \quad\left[\because V_2=2 V_1=2 V\right] \\ & \end{aligned}$

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