[Solved] According to the theory of relativity, which of the following al-ways remains constant?

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Q.	According to the theory of relativity, which of the following al-ways remains constant?
A.	Length of an object
B.	Time
C.	Space
D.	Velocity of light
Answer» D. 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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