Rankers Physics

Uncategorized: Practice Problem & Solution

A mass of diatomic gas ($\gamma = 1.4$) at a pressure of $2\text{ atm}$ is compressed adiabatically so that its temperature rises from $27^\circ\text{C}$ to $927^\circ\text{C}$. The pressure of the gas in the final state is: (2011 Mains)
$28\text{ atm}$
$68.7\text{ atm}$
$256\text{ atm}$
$8\text{ atm}$

Solution Explained:

To solve this problem, we apply the core principles of Uncategorized. Understanding the underlying formula is key to arriving at the correct answer below:

Using the adiabatic relation between pressure and temperature, $\frac{P_2}{P_1} = \left(\frac{T_2}{T_1}\right)^{\frac{\gamma}{\gamma-1}}$. Substituting $T_1 = 300\text{ K}$, $T_2 = 1200\text{ K}$, and $\gamma = 1.4$, we get $P_2 = 2 \times (4)^{3.5} = 256\text{ atm}$.

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