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: