Lesson: Chapter 4 — Waves and their applications
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How fast do electromagnetic waves travel in a vacuum?
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3 × 108 m s-1. More exactly 2.998 × 108 m s-1, the speed of light.
330 and 1400 m s-1 are the speeds of sound in air and in water. 3 × 105 is the speed of light in kilometres per second, not metres.
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