If $\mathrm{C}_{\mathrm{p}}$ and $\mathrm{C}_{\mathrm{v}}$ are molar specific heats of an ideal gas at…

If $\mathrm{C}_{\mathrm{p}}$ and $\mathrm{C}_{\mathrm{v}}$ are molar specific heats of an ideal gas at constant pressure and volume respectively and ' $\gamma$ ' is $\mathrm{C}_{\mathrm{p}} / \mathrm{C}_{\mathrm{v}}$ then $\mathrm{C}_{\mathrm{p}}=$ ( $\mathrm{R}=$ universal gas constant)
  1. $\frac{\gamma \mathrm{R}}{\gamma-1}$
  2. $\gamma \mathrm{R}$
  3. $\frac{1+\gamma}{1-\gamma}$
  4. $\frac{\mathrm{R}}{\gamma-1}$

Solution

Given, $\gamma=\frac{\mathrm{C}_{\mathrm{P}}}{\mathrm{C}_{\mathrm{V}}}$. $\begin{aligned} \therefore \quad & \frac{C_v}{C_p}=\frac{1}{\gamma} \\ & \frac{C_v-C_P}{C_p}=\frac{1-\gamma}{\gamma} \\ & \frac{-\left(C_P-C_v\right)}{C_P}=\frac{1-\gamma}{\gamma} \\ & \frac{-R}{C_p}=\frac{1-\gamma}{\gamma} \\ \therefore \quad & \frac{R}{C_p}=\frac{\gamma-1}{\gamma} \\ \therefore \quad & C_P=\frac{\gamma R}{\gamma-1} \end{aligned}$ $\ldots\left(\because C_p-C_v=R\right)$

Asked in: MHT CET 2024 (04 May Shift 2)

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