Thermal Physics

Question 1

What are properties of a Kelvin Scale

Answer 1

1. There is no upper fixed point
2. The lower fixed point is absolute zero temperature i.e 0K
3. It is a theoretical scale i.e it is not based on any physical property

Question 2

Define Ideal gas

Answer 2

Any gas which follows the relationship PV=nRT for all the values of pressure, volume and temperature

Question 3

Assumptions on Kinetic Energies

Answer 3

1. Gas molecules are in continuous random motion
2. There are zero intermolecular forces of attraction between ideal gas molecules
3. Volume of the gas is negligible as compared to the volume of the container
4. Gas molecules perform perfectly elastic collisions with the walls of the container
5. Ideal gas molecules behave as perfect spheres

Question 4

Define Avogadro’s constant

Answer 4

The number of atoms present in 0.012kg of carbon-12

Question 5

Why is speed written as

Answer 5

Since there are large numbers of molecules per unit volume therefore speed is taken to be mean average hence