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 O at the same time. O at different times, the echo under water returning more quickly. O at different times, the echo under water returning more slowly.

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 O at the same time. O at different times, the echo under water returning more quickly. O at different times, the echo under water returning more slowly.

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter16: Waves

Section: Chapter Questions

Problem 87P: A 250-Hz tuning fork is struck and the intensity at the source is I1at a distance of one meter from...

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Concept explainers

Stretched string

A stretched string is a wire which is made up of any metal that must have a larger length compared to its thickness. The ends of the wire are fixed, and when they oscillate or are plucked, it produces two reflected transverse waves of the same frequency and same amplitude. The waves or pulses are traveling in alternate directions and superimpose with one another. This waveform is named standing or stationary waves.

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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
O at the same time.
O at different times, the echo under water returning more quickly.
O at different times, the echo under water returning more slowly.

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