What Are Electrons And What Is J.J Thompson’s Contribution Towards Its Discovery?
admin A Few years back, we didn’t know the structure of atom; in fact John Dalton considered it to be as hardand dense and as the smallest and indivisible part of…
Atomic Structure and Wave Mechanics
How The Charge On Electron Was Determined By Robert Millikan?
Millikan used his famous oil drop technique to determine the charge on an electron. In this experiment, an air containing chamber is injected with an oil spray consisting of microscopic…
What Is Rest Mass And How It Differs From The Mass Of An Electron Moving At Higher Velocities?
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…
What Are Anode Rays?
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…
What Is Rutherford Scattering Experiment?
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…
What Is Rutherford Atomic Model?
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…
What Is Atomic and Mass Number?
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 and give the Energy density- Wavelength curve for a black body radiation at different temperatures and explain its characteristics.
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.…
What is Quantum Theory of Radiation?
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…
What is Photoelectric Effect?
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…