NCERT Class 11 Physics Chapter 13 Kinetic Theory CBSE Board Sample Problems

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Question14:

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

Answer:

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 ?

Answer:

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?

Answer:

Question 17:

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

Answer:

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.)

Answer:

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.

Answer: