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What is the second of Einstein's two postulates of special relativity?
ALight's speed depends on the light's color
BLight's speed changes if the observer accelerates
CLight's speed never depends on the source's motion
DLight's speed differs between inertial frames
Answer & Solution
Correct answer: C. Light's speed never depends on the source's motion
1. Einstein's second postulate concerns the behaviour of light itself.
2. It states that the speed of light is the same in all inertial frames and does not depend on the speed of its source.
3. Color of the emitted light does not change this constant speed.
4. Saying the speed changes with acceleration or differs between inertial frames directly contradicts the postulate.
5. So a constant speed of light unaffected by the source is correct.
_Source: OpenStax Physics (CC BY 4.0), Ch 10 "Special Relativity", section 10.1 Postulates of Special Relativity_
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