This would be the first lecture of the Quantum Mechanics series for anyone who is interested. Before starting this series you should have some prior knowledge about Quantum Mechanics. Let me tell you some fundamental laws of Quantum Mechanics before we move on to the main topic, Identical experiments do not give identical results. Whenever you’re doing an experiment in Physics, let’s say you calculate the velocity to be 2 m/s, in Quantum Mechanics if you do the same project with the same set of eyes and the same conditions, the result can be different, might be more or might be less. We don’t know.

Black Body is defined as the body that is emitting and absorbing radiation at any time and at any place. It is constantly absorbing and giving out radiation without the change in Temperature T. But normal bodies like your Laptop have different capabilities of absorbing and reflecting, sometimes it is absorbing and sometimes it is reflecting. But the black body is each second absorbing and emitting. Hence, the temperature T of the Black Body does not change because the amount of energy E that is going out is equal to the amount of the energy going in. Net Temperature and Energy is zero.

Same is the logic with the radiation, the amount of radiation emitted or absorbed by a Black Body is called Black Body radiation.

This was an experiment performed by a student who found that light was both particle and of wave nature, hence he questioned it and experimented. He came up with this idea and tested it. He found out that this body does emit radiation continuously, the radiation is absorbed by the black body and only emitted in a packet form. It emits radiation in discrete energy packets as called ‘Quanta’ by the famous Max Planck.

This was another proof that light is a particle because a wave emits energy continuously and does not wait for a specific amount of time to collect energy and transfer it.

I will include some formulas on the next blog on the amount and the type of radiation emitted by a surface. The next blog will mostly include Wein’s displacement law, Stefan’s law and Max Planck’s famous energy density equation.