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.


Chapter Exercises

Short Answer
Objective I
Objective II
Exercises

More Exercise Questions

1

Does gas have just two specific heat capacities or more than two? Is the number of specific heat capacities of a gas countable?
2

Can we define specific heat capacity at constant temperature?
3

Can we define specific heat capacity for an adiabatic process?
4

Does a solid also have two kinds of molar heat capacities CP and CV? If yes, do we have CP > CV? Is CP – CV = R?
5

In a real gas the internal energy depends on temperature and also on volume. The energy increases when the gas expands isothermally. Looking into the derivation of CP – CV = R, find whether CP – Cv will be more than R, less than R or equal to R for a real gas.
6

Can a process on an ideal gas be both adiabatic and isothermal?
7

Show that the slope of p –V diagram is greater for an adiabatic process as compared to an isothermal process.
8

Is a slow process always isothermal? Is a quick process always adiabatic?
9

Can two states of an ideal gas be connected by an isothermal process as well as an adiabatic process?
10

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

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