A monoatomic gas having $\gamma=\frac{5}{3}$ is stored in a thermally insulated container and the gas is…

A monoatomic gas having $\gamma=\frac{5}{3}$ is stored in a thermally insulated container and the gas is suddenly compressed to $\left(\frac{1}{8}\right)^{\text {th }}$ of its initial volume. The ratio of final pressure and initial pressure is: ( $\gamma$ is the ratio of specific heats of the gas at constant pressure and at constant volume)
  1. 16
  2. 40
  3. 32
  4. 28

Solution

$\begin{aligned} & P_i V_i^\gamma=P_f V_f^\gamma \\ & \frac{P_f}{P_i}=\left(\frac{V_i}{V_f}\right)^\gamma=(8)^{5 / 3} \\ & \frac{P_f}{P_i}=32\end{aligned}$

Asked in: JEE Main 2025 (08 Apr Shift 2)

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