Exam-style question
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In special relativity, the speed of light in vacuum is considered to be:.
- A.a variable constant that changes with time.
- B.a universal constant, the same for all inertial observers.
- C.dependent on the gravitational potential.
- D.dependent on the observer's acceleration.
Model answer
What a good answer should say
- a universal constant, the same for all inertial observers.
Explanation
Why this works
Formula/rule: constancy of the speed of light. Substitution: none.
Working: The second postulate declares that c ≈ 3.00 × 10^8 m/s is a universal constant, unaffected by time, gravity, or acceleration of observers. Answer: c is universal constant.
Units/conclusion: c = 3.00 × 10^8 m/s, same for all inertial observers.
Common mistake
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