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## Planck’s radiation law derivation

Rayleigh Jeans law and Wien’s formulae were failed to solve the problem of distribution of spectral radiancy among various wavelengths in cavity radiations because these formulas were based upon the classical theory. Planck’s quantum theory of radiation In 1900,Max Planck gave the new concept about the nature of radiation,called quantum theory of radiation in which planck assumed the discrete nature ...

## State the Pauli Exclusion Principle

According to Pauli Exclusion Principle no two electrons can have samples values of the quantum numbers n, l,ml and ms or they can not have all these quantum numbers similar; at least one of the four numbers which are strictly required to Specify the state of an electron should be different from the quantum numbers which specify the state of an other electron ...

## difference between centre of mass and centre of gravity

Centre of mass and centre of gravity are often considered same terms,but actually they are two different terms. Center of mass is a point in a body where net force causes the body to move without rotation,while center of gravity is the point where whole weight of the body acts vertically downward. Centre of mass of a system is such a ...

## What is difference between Reflection and refraction?

Reflection and refraction are two different properties of light. Reflection of light is the process in which light bounce back on striking the surface,while refraction of light is the process in which light changes its direction as it passes from one medium to another medium.     Reflection Vs Refraction Reflection Refraction When light falls from one medium on the ...

## What is difference between heat and temperature?

Heat and temperature are two different quantities. Heat is the form of energy that transfer from hot body to cold body.Its unit is joule.While the temperature is the degree of hotness and coldness of the body.Its SI unit is kelvin. heat and temperature difference Heat Temperature Heat is a form of energy that can transfer from hot body to cold ...

## Difference between force and pressure

The difference between force and pressure is that “Force is an agency which moves or tends to move ,stops or tends to stop the motion of a body.Force is the vector quantity.While pressure is the force acting normally per unit area on the surface of a body.It is a scalar quantity. Relation between pressure and force Mathematically ,pressure can be ...

## Difference between renewable and non renewable energy sorces

Renewable and nonrenewable are two sources of energy.The resources of energy that can be regenerated again and again are called renewable energy resources.While the energy sources that cannot be regenerated again and again are called non renewable resources of energy.The Difference between renewable and nonrenewable sources of energy can be done on the basis of nature,cost,environment friendly,quantity etc.. Renewable energy ...

## Renewable energy sources list

“Renewable energy sources are those energy sources that can be regenerated quickly.”There are many sources of energy such as coal,oil and natural gas.These fuels are called fossil fuels.These fuels would not last forever.They are not recoverable.These sources are called non renewable energy sources.Renewable energy sources list is given below. Renewable energy sources list Energy from tides Energy from waves energy ...