Question

according to the special theory of relativity:

» mass and energy are same entities

» mass and energy are same entities but interconvertible

» mass and energy are different entities but interconvertible

» mass and energy are different entities but not interconvertible​

Answer 1

Answer:

Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics. Many commentators have observed that in Einstein’s first derivation of this famous result, he did not express it with the equation E=mc2. Instead, Einstein concluded that if an object, which is at rest relative to an inertial frame, either absorbs or emits an amount of energy L, its inertial mass will correspondingly either increase or decrease by an amount L/c2.