In the year 1905, Einstein submitted a paper to the Annalen der Physik in which he proved and stated that E= mc² (To know how the discovery was done you can watch this documentary). It is considered as the most important formula in the physics world as it proves that the three entities Time, mass and energy are relatively linked to each other. The theory of Special relativity is considered the central heart of modern physics.
In the Formula, E stands for Energy, M stands for Mass and C stands for the speed of light. The formula expresses the fact that mass and energy are the same physical entity and can be changed into each other. The application of E= mc² is widely applicable in quantum mechanics.
Let’s consider if Einstein had not discovered the formula. What the world would have missed until the present day? We would not have realized how the sun emits energy- nuclear fusion. We would not have come to know about nuclear fissions and thus no nuclear power plants. Even the Twin Paradox would be just a thought experiment and perhaps the movie Interstellar might have been not created. But the most important creation which would not have been possible is –Atom Bomb.
The whole world had witnessed the power of the formula when the first atomic bomb was dropped on Hiroshima. The result of this led to the death of hundreds of Japanese citizens. It would be true to say that Einstein’s Formula led birth to the most devastating weapon of mankind- the atomic bomb.
The development of PET scanners, telecommunication with satellites and rovers, nuclear energies are all impossible without this miracle formula. Particle accelerators studying fundamental physics are another place where Einstein’s equation becomes useful. The equations help us in understanding the very basic natural processes of the universe, from microscopic radioactivity to Big Bang Theory.