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Linear superposition, interference calculation

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A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 1.5 s after shouting. Estimate the length of the lake.

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https://brainmass.com/physics/sound-hearing/linear-superposition-interference-calculation-33815

Solution Summary

The expert examines linear superposition and interference calculations. The length of the lake is estimated.

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Linear Superposition and Interference Phenomena

The location of the speakers in this problem is what's throwing me off.

Two speakers, one directly behind the other, are each generating a 245-Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? The speed of sound is 343 m/s.

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