Einstein's famous mass equation E=mc^2, E for energy, m for mass, and c for speed of light. An important result of relativity is the relationship between mass and energy. Quality and energy are not interchangeable. They are based on the special theory of relativity. In 1915 he proposed general relativity. Because in classical mechanics, mass and energy are independent and irrelevant, in relativistic mechanics, energy and mass are interchangeable. Einstein's paper "An Inspiring Perspective on the Generation and Transformation of Light", published in June 1905, explains the nature of light, which also earned him the Nobel Prize in Physics in 1921.
Einstein energy equation
Energy: E = mc2
E = energy
m = quality
c = speed of light
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