In an adiabatic expansion of a gas initial and final temper…

Physics Thermodynamics Adiabatic Process Single Correct MCQ

Published on: September 12, 2026

In an adiabatic expansion of a gas initial and final temperatures are $T_1$ and $T_2$ respectively, then the change in internal energy of the gas is

$(a) \frac{R}{\gamma - 1} (T_2 - T_1) \quad (b) \frac{R}{\gamma - 1} (T_1 - T_2) \quad (c) R (T_1 - T_2) \quad (d) \text{Zero}$

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The correct answer is:

$\Delta U = - \Delta W = - \frac{R(T_1 - T_2)}{(\gamma - 1)} = \frac{R(T_2 - T_1)}{\gamma - 1}$

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