Description : According to the theory of relativity, which of the following al-ways remains constant? (1) Length of an object (2) Time (3) Space (4) Velocity of light
Last Answer : (4) Velocity of light Explanation: The theory of relativity, or simply relativity, generally encompasses two theories of Albert Einstein: special relativity and general relativity. Concepts introduced by the ... to each other. The speed of light is nonetheless invariant, the same for all observers.