👉 Relativity is a branch of physics that deals with the relationship between time, length, and mass in an accelerating reference frame. It describes how these three quantities change as you move from one inertial frame to another. The theory was first proposed by Albert Einstein in 1905, but its implications were not fully understood until the late 20th century when it was discovered that time dilation could be explained by special relativity.
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What is the definition of Relativity? 🙋
👉 The concept of mass-energy equivalence, where energy is quantified in terms of mass or other properties, was first introduced by Albert Einstein in his famous 1905 paper "Einstein's Theory of Relativity." The key insight was that, according to special relativity, a body moving at the speed of light (c=29.79 miles per second) would appear stationary from an inertial observer's perspective; this apparent motion was caused by the relative velocity between the source and receiver.
