alleryStart learning →What is the first of Einstein's two postulates of special relativity?
AThe speed of light doubles for a moving source
BMass increases without limit at rest
CTime is identical for every observer everywhere
DLaws of physics are the same in every frame
Answer & Solution
Correct answer: D. Laws of physics are the same in every frame
1. Einstein began the theory of special relativity with two postulates.
2. The first postulate states that the laws of physics are the same in all inertial reference frames.
3. The speed of light does not double for a moving source, and mass at rest does not increase without limit.
4. Time is not identical for every observer once relative motion is involved, which is the opposite of a founding postulate.
5. So the same laws of physics in all inertial frames is correct.
_Source: OpenStax Physics (CC BY 4.0), Ch 10 "Special Relativity", section 10.1 Postulates of Special Relativity_
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