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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoKTGMedium2 minQB

PhysicsMediumassertion reason

Assertion (A) : When a diatomic ideal gas (vibrations frozen) is heated from $T_{1}$ to $T_{2}$ , exactly $\frac{3}{5}$ of increase in internal energy is translational.

Reason (R) : A rigid diatomic gas has 5 active degrees of freedom, of which 3 are translational.

Options:

Answer:

Solution:

$Δ U = nC_{V} Δ T, f = 5, C_{V} = \frac{5 R}{2}$

Translational part $= \frac{3}{2} R Δ T$ ; fraction $= \frac{3/2}{5/2} = \frac{3}{5}$

So reason is correct, and it correctly explains the assertion hence (A).

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:KTG

⏱ 2mℹ️ Source: QB

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