NEET Physics Question - Thermal Physics

Assertion (A): The atoms of a monoatomic gas have less degrees of freedom as compared to molecules of the diatomic gas.

Reason (R): The ratio of \(\frac{C_p}{C_v}\) for an ideal diatomic gas is more than that for an ideal monoatomic gas (where \(C_p\) and \(C_v\) have usual meaning).

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

Monoatomic gas has 3 degrees of freedom, diatomic has 5 (or 7). So (A) is true. The ratio \(\gamma = 1 + \frac{2}{f}\) is \(5/3\) for monoatomic and \(7/5\) for diatomic. Since \(5/3 > 7/5\), (R) is false.

Rankers Physics

Degrees of Freedom and Heat Capacity Ratio

Solution:

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