KTG

Question 1

What are real gas and ideal gas?

Answer 1

Real gas: The gas in which intermolecular forces are small but not zero.
Ideal gas: The gas in which intermolecular forces are zero.

Question 2

State Boyle’s Law

Answer 2

At constant temperature, pressure is inversely proportional to volume.

Question 3

State Charle’s Law

Answer 3

At constant pressure, volume is directly proportional to temperature.

Question 4

State Gay- Lussac’s Law

Answer 4

At constant volume, pressure is directly proportional to temperature.

Question 5

What are the assumptions?

Answer 5

1. A gas consists of many tiny particles known as molecules.
2. The molecules are rigid and perfectly elastic spheres of minimal diameters.
3. All the molecules of the same gas are identical in shape, size, and volume.
4. The volume occupied by the molecules is less than that occupied by the gas.
5. The molecules are always in a state of random motion.
6. Due to this random motion molecules always colloid with each other and the walls of the container.
7. Between two successive collisions the molecule travels in a straight line and with constant speed is called a free path.

Question 6

Define Mean velocity

Answer 6

The average of velocities of all the molecules.

Question 7

Define Mean Square velocity

Answer 7

The average square of velocities of all the molecules.

Question 8

Define Root Mean Square Velocity

Answer 8

The root of mean square velocity of all the molecules.

Question 9

Define Degree of Freedom

Answer 9

The degree of Freedom can be defined as the number of coordinates describing a system’s configuration.

Question 10

Define the Law of equipartition of energy

Answer 10

The Law of equipartition of energy states that the total energy of a system is equally distributed amongst each degree of freedom and energy corresponding to each degree of freedom is half kbT.

Question 10

Define the Law of equipartition of energy

Answer 10

The Law of equipartition of energy states that the total energy of a system is equally distributed amongst each degree of freedom and energy corresponding to each degree of freedom is half kbT.

Question 11

Define Specific Heat

Answer 11

It is defined as the amount of heat required to raise the temperature of a unit mass by 1C or 1K.

Question 12

Define Newton’s Law of Cooling

Answer 12

It states that rate of loss of heat is directly proportional to excess of body to its surrounding provided that the excess is small.

Question 12

Define Newton’s Law of Cooling

Answer 12

It states that the rate of loss of heat is directly proportional to the excess of the body to its surrounding provided that the excess is small.

Question 13

Define the coefficient of absorption

Answer 13

It is defined as the ratio of the amount of radiant energy absorbed to the amount of radiant energy incident.

Question 14

Define the coefficient of reflection

Answer 14

It is defined as the ratio of the amount of radiant energy reflected to the amount of radiant energy incident.

Question 15

Define the coefficient of transmission

Answer 15

It is defined as the amount of radiant energy transmitted to the amount of radiant energy incident.

Question 16

Define Athermanous substance

Answer 16

A substance that does not allow heat radiation to pass is called an athermanous substance.

Question 17

Define Diathermanous substance

Answer 17

A substance that does allow heat radiations to pass is called a diathermanous substance.

Question 18

Define Emissive Power

Answer 18

It is defined as the amount of radiant energy emitted per unit area per unit time.

Question 19

Define the Coefficient of Emissive Power

Answer 19

It is defined as the ratio of the emissive power of the ordinary body to the emissive power of the black body.

Question 20

Define Kirchoff’s Law of Radiation

Answer 20

It is defined as the ratio of the emissive power of the ordinary body to the coefficient of absorption which is constant is equal to the emissive power of the black body.