What is time dilation?
ATime passing more slowly for a moving observer
BTime passing more quickly for every observer without exception
CA clock physically breaking down at high speed
DTime stopping completely for a stationary observer
Answer & Solution
Correct answer: A. Time passing more slowly for a moving observer
1. Time dilation describes how time passes more slowly for an observer who is moving relative to another observer.
2. It is the moving observer's clock that runs slow as measured by the other, not every observer speeding up.
3. No physical clock damage is involved, and a stationary observer's own time does not stop.
4. So time passing more slowly for a moving observer is correct.
_Source: OpenStax Physics (CC BY 4.0), Ch 10 "Special Relativity", section 10.2 Consequences of Special Relativity_
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