Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoKTGEasy2 minPYQ_2020

PhysicsEasysingle choice

Consider a gas of triatomic molecules. The molecules are assumed to be triangular and made of massless rigid rods whose vertices are occupied by atoms. The internal energy of a mole of the gas at temperature T is:

Options:

Answer:

Solution:

The formula of internal energy of a gas is given by

$U = \frac{f}{2} RT$

Here $R$ is the gas constant and $T$ is temperature.

$(R = 8.314 J {mol}^{- 1} K^{- 1})$

For the given configuration of triatomic molecules, the degree of freedom $f = 6$

$\Rightarrow U = \frac{6}{2} RT = 3 RT$

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:KTG

⏱ 2mℹ️ Source: PYQ_2020

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