An echo is sound that returns to you after being reflected
Chapter 16, Problem 16.48(choose chapter or problem)
An echo is sound that returns to you after being reflected from a distant surface (e.g., the side of a cliff). Assuming that the distances involved are the same, an echo under water and an echo in air return to you ______________. (a) at different times, the echo under water returning more slowly (b) at different times, the echo under water returning more quickly (c) at the same time
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