HC Verma - Concepts of Physics Part 2

Book: HC Verma - Concepts of Physics Part 2

Chapter: 27. Specific Heat Capacities of Gases

Subject: Physics - Class 12th

Q. No. 10 of Short Answer

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10

The ratio CP/CV for gas is 1.29. What is the degree of freedom of the molecules of this gas?

Given:


= 1.29


Formula used:


… (i),


where


γ = ratio of molar heat capacities at constant pressure to constant volume


f = number of degrees of freedom


(i) becomes :



=> … (ii)


Substituting γ = 1.29 in (ii), we get


f = = 6.89 which is approximately equal to 7.


Thus, the number of degrees of freedom is approximately equal to 7.


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