Assertion : For monoatomic gas atom, the number of degrees of freedom is 3.
Reason : $\frac{C_{p}}{C_{V}} = γ = \frac{5}{3}$

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Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

Assertion is correct but Reason is incorrect.

Assertion is incorrect but Reason is correct.

answer is B.

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Detailed Solution

Using the relation, $γ = 1 + \frac{2}{f}$

(where, f is the number of degrees of freedom for gas atom)
For monoatomic gas, f = 3

Hence, $γ = \frac{C_{p}}{C_{V}} = 1 + \frac{2}{3} = \frac{5}{3}$

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