Statement-1 : Experimental results indicate that the molar specific heat of hydrogen gas at constant volume below 50 K is equal to 2 5 R , where R is the universal gas constant. Statement-2 : A diatomic hydrogen molecule possesses three translational and two rotational degrees of freedom at all temperatures.

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Statement-1 : Experimental results indicate that the molar specific heat of hydrogen gas at constant volume below 50 K is equal to $\frac{5}{2} R$ , where R is the universal gas constant.

Statement-2 : A diatomic hydrogen molecule possesses three translational and two rotational degrees of freedom at all temperatures.

Options:

Answer:

Solution:

Below 50 K rotational modes freeze out, so $C_{V} = \frac{3}{2} R$ , not $\frac{5}{2} R$ : statement-1 false. Rotational degrees of freedom are not active at all temperatures: statement-2 false.

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:KTG

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