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

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
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(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 theories of relativity include: Measurements of various quantities are relative to the velocities of observers. In particular, space and time can dilate. Space time: space and time should be considered together and in relation to each other. The speed of light is nonetheless invariant, the same for all observers.
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