What is Inverse square law

There is a law in physics commonly known as inverse square law. As the name suggests, in this law some quantity is inversely related to another quantity. Let us discuss in detail. Continue reading “What is Inverse square law”

Gravitational force and its properties

Gravitational force is the weakest force in nature. There are many properties of gravitational force, but first of all let us discuss about the various fundamental forces present in nature. There are mainly four types of forces exist in nature:
1. Gravitational force
2. Weak nuclear force
3. Electromagnetic force
4. Strong nuclear force.
Today I will discuss about the gravitational force
We all know that earth and other planets revolve around the sun but why? We are attracted towards the earth due to gravity of earth or in simple words force of attraction of earth. Basically gravitational force is the force between any two objects. The objects can be microscopic or macroscopic. Continue reading “Gravitational force and its properties”

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Energy Associated With A Charge Distribution

Do you know that the energy is associated with a charge distribution . This  associated energy is also known as Electrostatic Energy. Let us calculate this energy associated with charge distribution:

When a test charge is moved from a point of lower potential to a point of higher potential, the potential energy of the system increases. But, there is a decrease in potential energy when a test charge is moved from higher to lower potential. Continue reading “Energy Associated With A Charge Distribution”

Einstein Coefficient Relation

Einstein Coefficient Relation derivation and discussion:

Einstein showed the interaction of radiation with matter with the help of three processes called stimulated absorption, spontaneous emission and stimulated emission. He showed in 1917 that for proper description of radiation with matter,the process of stimulated emission is essential.Let us first derive the Einstein coefficient relation on the basis of above theory:

Let N1 be the number of atoms per unit volume in the ground state E1 and these atoms exist in the radiation field of photons of energy E2-E1 =h v such that energy density of the field is E. Continue reading “Einstein Coefficient Relation”