AIIMS 2019 Physics Degrees of Freedom Assertion Reason Question

The assertion is true because vibrational degrees of freedom in diatomic gases, such as O₂ or N₂, become significant only at high temperatures where thermal energy is sufficient to excite these modes. However, the reason is false; diatomic molecules have one vibrational mode that involves both atoms moving relative to each other, not two degrees of freedom in one direction. Option A is incorrect because the reason does not correctly explain the assertion, while option B is incorrect for the same reason. Option D is incorrect because the assertion is indeed true.