Lesson: Chapter 4 — Waves and their applications
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A SONAR pulse returns 4 s after it is sent. Sound travels at 1440 m s-1 in water. How deep is the sea?
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2880 m. The sound travels 1440 × 4 = 5760 m, but that is down and back, so the depth is half: 2880 m.
5760 m forgets to halve the round trip.
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