## Physics: Principles with Applications (7th Edition)

Published by Pearson

# Chapter 12 - Sound - Questions: 13

#### Answer

Noise-canceling devices rely on the principle of destructive interference.

#### Work Step by Step

The electronics detect the noise, invert it, and then create an opposing wave ($180^{\circ}$ out of phase with the original). The created waveform is designed to superpose with the original waveform to give a net sound wave that is close to zero.

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