alleryThe speed of light in vacuum is
A3.0 × 10⁸ m/s
B3.0 × 10⁶ m/s
C340 m/s
D3.0 × 10¹⁰ m/s
Answer & Solution
Correct answer: A. 3.0 × 10⁸ m/s
1. Your syllabus gives c = 299,792,458 m/s ≈ 3 × 10⁸ m/s.
2. Light and all electromagnetic waves travel at c in vacuum.
3. 340 m/s is the approximate speed of sound in air (a mechanical wave).
4. c is a universal constant not requiring a medium.
_Source: syllabus Physics, Ch 14 "Waves", §14.1_
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