History of Quantum mechanics

Before the advent of modern physics the success of previous scientific theories particularly Newton's theory of gravity, led French scientist Marques de laplace to argue about existence of universe which is governed by a complete set of laws in the beginning of 19th century he suggested about a set of deterministic laws that can predict the state of Universe in future by knowing its current state( for example if one knew the current position and speed of Planets of solar system at one instant one can determine its position and speed at other.)
This doctrine of our world been completely deterministic was registered by many people as it opposed the supremacy of godto do his handedness in running our universe, but still this belief remained the prominent person of people until a British scientist suggested that hot body like star should radiate energy at an infinite rate which brought in first indication of future abandonment of this deterministic world. As, it was belived in early 20th century according to classical physics hot booties radiate energy in the form of electromagnetic waves and the energy being radiated in the form of electromagnetic waves with frequency 1 million 2million remains same from waves with frequency 3 million 5 million. Since, number of waves being radiated is infinite the rate of energy being radiated is also infinite.
In order to disintegrate this seemingly ridiculous thesis, Max planck suggested that energy instead of being radiated in form of continuous wave is ejected in form of wave packets holding loops of energy, which he named "quanta", each quanta contained a certain amount of energy so higher the frequency larger the energy radiated ,but its implication for ending determinism philosophy came when a 6 month I just wanna Heisenberg perform an experiment to measure the position of a particle by striking it with a light beam. Since the particle was smaller than the wavelength of light so, in order to measure the position of the particle with precision, it had to be struck with high frequency light beam but doing that would cause huge disturbance in the velocity of the particle. This phenomena led Werner Heisenberg to formulate his famous Uncertainty Principle which stated that , more precisely we try to me that the position of a particle ,with lesser position we measure its velocity and vice versa ,which for the became the basis of modern quantum mechanics. His results concluded that ,adding the uncertainty in position of a particle and its uncertainty in velocity would never be lesser than quantity " Planck's constant " This put a complete decided made on Laplace stream of deterministic world. But still still where some scientist out there in quest for finding a set of laws which can help us for predicting the future state of our universe. This ledWerner Heisenberg, Erwin Schrodinger and Paul Dirac in 1920 formulate mechanics into a new set of Physics laws which we now known as quantum mechanics which is based on uncertainty principle.
Quantum mechanics doesn't tell us a single result , rather, it suggest a most probable outcome based on number of observations.
Quantum mechanics suggests light to have both wave and particle nature based on planck's concept of quanta which Einstine had proposed in 1905 in his famous paper about photoelectric phenomenon which state the particle nature of light.
Uncertainty Principle also suggest a particle to have a wave like nature as it randomly get displaced and ,this was proved in famous double slit experiment ,which we will be talking about in our later blogs. It describes the particle in form of both wave and particle.
Quantum mechanics governs almost all aspects of modern digital technology and it is applicable on working of transistors and capacitors which are the basis of our electronic devices.
But still after the hundred years of its discovery we haven't been able to incorporate it with general relativity which manifests the smooth picture of our world but , we are in a long quest for finding such a theory.


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By: Harsh Kumar Jha

Team: Amartya Sen and Hashir Razzaq

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