A polyatomic gas $\left(Y=\frac{4}{3}\right)$ is compressed to $\left(\frac{1}{8}\right)^{\text {th }}$ of…

A polyatomic gas $\left(Y=\frac{4}{3}\right)$ is compressed to $\left(\frac{1}{8}\right)^{\text {th }}$ of its volume adiabatically. If its initial pressure is $p$, its new pressure will be
  1. 8p
  2. 16p
  3. 2p
  4. 6p

Solution

For an adiabatic process: $p V \gamma=$ constant Let initial pressure be $p$ and volume $V$, then the final pressure is $P$ and volume $\frac{V}{8}$. $\begin{aligned} & \Rightarrow p V^{4 / 3}=P\left(\frac{V}{8}\right)^{4 / 3} \\ & \Rightarrow P=8^{4 / 3} p=16 p \end{aligned}$

Asked in: MHT CET 2022 (08 Aug Shift 1)

Practice more Thermodynamics questions on Aicharya