Absolute temperature can be calculated by

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(A) According to the kinetic theory of gases,the mean square velocity $\overline{v^2}$ of gas molecules is directly proportional to the absolute tempe

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Mean square velocity

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(A) According to the kinetic theory of gases,the mean square velocity $\overline{v^2}$ of gas molecules is directly proportional to the absolute temperature $T$ of the gas.Mathematically,$\frac{1}{2} m \overline{v^2} = \frac{3}{2} k_B T$,which implies $\overline{v^2} \propto T$.Since the mean square velocity is a direct measure of the average kinetic energy of the molecules,which in turn depends on the absolute temperature,option $(a)$ is the correct way to relate or calculate the temperature.

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