Modern Physics

The basic difference between stress and strain is that stress is the deforming force per unit area.Its unit is same as pressure which is N/m²,While strain is the apparent change in the shape,volume or length of object caused due to stress is called strain.Strain has no unit. Stress It is defined as the force applied on unit area to produce ...

The basic difference between young’s modulus,bulk modulus and shear modulus is that Young’s modulus is the ratio of tensile stress to tensile strain,bulk modulus is the ratio of volumetric stress to volumetric strain and shear modulus is the ratio of shear stress to shear strain. Young’s modulus The ratio of tensile stress to tensile  strain is called young’s modulus. Young’s ...

Mechanical waves and matter waves are the types of waves.The basic difference between mechanical waves and matter waves is that mechanical waves required medium for propagation such as sound waves,while matter waves are the waves which contain information about the particles,these waves also known as de broglie waves. Mechanical waves The waves which required any medium for their propagation are ...

How many types of elementary particles are there? The elementary particles are simple particles which are not the combination of other particles. For example, an electron is an elementary particle. There are 30 elementary particles out of which the following 7 elementary particles are stable out the nucleus. List of elementary particles Electron Proton Neutron Photon Neutrino Antineutrino Positron Anti-proton ...

Properties of laser light are given in the list light of laser is highly monochromatic Its light is highly coherent laser light is highly directional  light of laser can be sharply focused Now we will discus in detail about characteristics of laser light Laser light is highly monochromatic Tungsten light spread over a continuous spectrum, gives no basis for comparison. ...

What is black body radiation in physics? When a body is heated,it emits radiation.The nature of the radiation depends upon the temperature.At low temperature,a body emits radiation which is principally of long wavelengths in the invisible infrared region.At high temperature ,the proportion of shorter wavelength radiation increases. Furthermore,the amount of emitted radiation is different for different wavelengths.It is of interest ...

 Bohr’s theory of the  hydrogen atom The Rutherford model of the atom and the experimental formula of atomic spectra helped Bohr is solving the problem of atomic structure.In 1913 he proposed a model for the structure of a hydrogen atom based on his experimental observations.  Bohr atomic model postulates Neil Bohr based his theory of hydrogen atom on the following ...

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 ...

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 ...

Einstein give two postulates of Special theory of relativity.Which are given in the list below: The laws of physics are the same in all inertial frames of reference. The speed of light in free space has the same value in all inertial frames of reference in all directions. Theory of Relativity The theory of relativity is concerned with the way ...