RE-NEET2026Physics-Thermodynamics
RE-NEET 2026 Physics Degrees of Freedom MCQ Question
Type: MCQ-conceptual-Medium-Class 11
An ideal gas is made of polyatomic molecules. Each of the molecules has three translational, three rotational and f number of vibrational modes. If the ratio of heat capacities Cₚ/Cᵥ of the gas is 8/7, then the value of f is:
A
3
B
2
C
1
D
4
Correct Answer
Option A
Detailed Explanation
For a polyatomic gas, Cₚ/Cᵥ = 1 + 2/(³⁺ f). Given Cₚ/Cᵥ = 8/7, solving gives f = 3.
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