NCERT Solutions for Class 11 Physics Chapter 13 come with elaborate explanations and precise answers on crucial concepts that students need to have a solid understanding of, in order to clear their entrance exams with an excellent score.
Ch 13 Physics Class 11 constitutes a major portion in the entrance exams. This chapter spans over some of the most crucial concepts like the gas laws proposed by different scientists, atomic theory, importance and uses of constant values like Boltzmann constant and Avogadro’s number, postulates of kinetic theory, and specific heat capacities.
Having a strong grasp of these topics is very important for students to solve the large number of problems that might come from this chapter. Understanding these will also lay a good foundation for the more complex concepts discussed in the succeeding chapters as well as for their succeeding year’s board exams.
1. What is Kinetic Theory of Gases?
Kinetic theory of gases is a theory revolving around the assumption of gas molecules as very tiny spherical particles, on the basis of which many fundamental gas properties are derived relating to their thermodynamic behaviour.
For detailed explanations on how the Kinetic Theory explains Boyle’s Law and is in accordance with Newton’s Laws of Motion, refer to NCERT Solutions for Class 11 Physics Chapter 13.
2. What is Stated in Charles' Law?
Charles’ Law states that the volume of a gas varies proportionally with the absolute temperature, provided pressure is remaining constant.
It is denoted by VT = k (constant), where k is dependent on pressure and the number of moles n.
From the above statement, it is derived V1 / T1 = V2 / T2, where V1 and T1 denote initial values, and V2 and T2 stand for the final values of volume and temperature, respectively.
It is one of the experimental gas laws used to determine the behaviour of gases with varying temperatures.
3. What do the Postulates of Kinetic Theory State?
The main postulates of the kinetic theory of Gases are - The gas molecules occupy a negligible amount of space inside a container.
They follow a linear motion while colliding with container wall and each other.
They do not exert any attractive or repulsive force on each other except during collision.
The collisions among gas molecules are perfectly elastic, that is there is no loss or gain of kinetic energy in the process, and total kinetic energy remains constant.
Collisions of the gas molecules with the container wall give rise to gas pressure.
4. What is the kinetic theory of gases according to Class 11 Physics?
Kinetic theory gives the basic idea of the behaviour of the gases as the gases are made up of fast-moving atoms or molecules. The kinetic theory of gases was proposed by Maxwell, Boltzmann, and others in the nineteenth century. An ideal gas is a gas that strictly obeys the gas laws like Charles’ law, Boyle’s law, and Gay Lussac’s law. The ideal gas molecule is a point mass and force of attraction or repulsion does not exist.
5. What are the postulates of the kinetic theory of gases?
The five main postulates of the kinetic theory of gases are;
The gas molecules move randomly.
The gas particles occupy a negligible volume.
The particles do not exert any force on each other.
Collisions between the particles are elastic.
The average kinetic energy of the particles is proportional to the temperature measured in kelvins.
You can download the NCERT Solution PDF file free of cost from the link of NCERT Solutions for Chapter 13 of Class 11 Physics.
6. What does the kinetic theory of gases explain?
The kinetic theory of gases explains the basic macroscopic properties of gases such as volume, pressure, and temperature and some transport properties such as viscosity and thermal conductivity as well. It gives the basic idea of the behaviour of gases as gases are made up of rapidly moving atoms and molecules. This is possible because the short-range interatomic forces which are of great importance in solids and liquids can be neglected in gases.
7. What are the 5 assumptions of the kinetic theory of gases?
The five assumptions are-
The gases consist of an infinite number of particles known as molecules which constantly and randomly move in different directions.
The distance between the two molecules is greater than the individual size of the molecules.
The time interval in the collision between the two molecules and the surroundings is very small.
All the molecules of the gas obey the laws of motion
Only elastic collisions exist in between the molecules.
8. What are the most important questions to cover in Chapter 13 of Class 11 Physics?
Students can download the most important questions to cover in Class 11 Physics Chapter 13 kinetic theory from the CoolGyan website or app. The important questions can help students score high marks in Class 11 Physics. Additional questions are also given here for practice that can help students to understand the concepts. The additional questions are prepared from the previous year's papers of different schools. All the answers are given according to the latest guidelines issued by the CBSE board and are available on the CoolGyan app and the website.
