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QPages 76-77: Q4: HC Verma: Concepts of Physics - Volume 2 Specific Heat Capacities of Gases Pages 76-77: Q4 Solution: Let and denote the molar heat capacities of an ideal gas at…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently assume the heat‑capacity ratio $\gamma=C_p/C_v$ is a universal constant, but it depends on the gas’s degrees of freedom; only the difference $C_p-C_v=R$ holds for all ideal gases.

Let

C_v

and

C_p

denote the molar heat capacities of an ideal gas at constant volume and constant pressure respectively. Which of the following is a universal constant?

Multiple Choice Options

A $C_p/C_v$
B $C_p C_v$
C $C_p - C_v$
D $C_p + C_v$

Step-by-Step Verified Solution

**Answer:** (c) C_p - C_v. **Step-by-Step Explanation:** C_p - C_v = R, which is a universal constant for all ideal gases.

All Questions in this Chapter

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