According to the theory of relativity, which of the following always remains constant ?
Correct answer: B. Velocity of light
- A. Length of an object
- B. Velocity of light
- C. Space
- D. Time
Explanation
Special relativity treats the speed of light in vacuum as invariant for all inertial observers. Length, time, and space measurements can vary with the observer’s motion, so they are not always constant.
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