The mass of an electron moving at a velocity much smaller than the velocity of light is known as rest mass. It is calculated by the relation:- M=e/ (e/m) =9.1091X10-31…
When careful experiments were carried out using perforated cathode in the discharge tube, a new type of rays known as anode rays were revealed. These rays after emitted by anode…
Ernest Rutherford performed an experiment in 1911 to know more about the structure of atom. He made a narrow beam of α particles (obtained from polonium) to strike an extremely…
Chadwick performed the same experiment of Rutherford but with beryllium/boron sheet few years after Rutherford’s. He found that new particles carrying no charge and mass almost equal to proton were…
Atomic Number The total number of unit positive charges present in the nucleus of an atom is known as its Atomic Number which is equal to the number of protons…
What is a black body? A body which absorbs all the radiations falling at its surface is called a black body. A black body is also a perfect emitter .i.e.…
The distribution of energy in the spectrum of radiations of a hot body cannot be explained by applying the classical concepts of physics. Max Planck gave an explanation to this…
This is an effect observed by Sir J.J Thompson while performing some of his famous experiments. He observed that electrons are ejected by a metal surface when light of a…
The Quantum Theory of Radiations by Max Planck can explain the photoelectric effect very well. Max Planck says that light is made of bundles of energy known as photons, energy…
It was Robert Millikan who tested the Einstein photoelectric equation. He first calculated the kinetic energy gained by the emitted electrons for a number of frequencies by applying an opposing…
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