# NCERT Class 11 Physics Chapter 13 Kinetic Theory CBSE Board Sample Problems (For CBSE, ICSE, IAS, NET, NRA 2023)

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## VSA

Question14:

Calculate the number of atoms in gold. Molar mass of gold is .

Molar mass of gold is , the number of atoms

No. of atoms in

Question 15:

The volume of a given mass of a gas atm is . What will be its volume at ?

Keeping P constant, we have

Question 16:

The molecules of a given mass of a gas have root mean square speeds of at and atmospheric pressure. What will be the root mean square speeds of the molecules of the gas at and atmospheric pressure?

Question 17:

Two molecules of a gas have speeds of and , respectively. What is the root mean square speed of these molecules.

Question 18:

A gas mixture consists of moles of oxygen and moles of neon at temperature . Neglecting all vibrational modes, calculate the total internal energy of the system. (Oxygen has two rotational modes.)

has degrees of freedom. Therefore, energy per mole

For moles of , energy

Neon has 3 degrees of freedom

Energy per mole

For mole of neon, energy

Total energy

Question 19:

Calculate the ratio of the mean free paths of the molecules of two gases having molecular diameters and . The gases may be considered under identical conditions of temperature, pressure and volume.