Chapter 12, Problem 13Q

Traditional methods of protecting the hearing of people who work in areas with very high noise levels have consisted mainly of efforts to block or reduce noise levels. With a relatively new technology, headphones are worn that do not block the ambient noise Instead, a device is used which detects the noise, inverts it electronically, then feeds it to the headphones in addition to the ambient noise. How could adding morenoise reduce the sound levels reaching the ears?

To determine

The hearing of people who work in areas with very high noise levels have consisted mainly of effort noise levels. How could adding more noise reduced the sound levels reaching the ears.

Answer to Problem 13Q

Solution:

The pressure fluctuations from the two sounds will cancel. Leading to no sound reaching the ears.

Explanation of Solution

Given:

The ears when the sound levels will reaching more noise to adding noise destructively the interface where original in sound. This occur the original sounds could be identified in frequency added, that can be perfectly out of phase. The original sound that can be peaks in pressure in perfectly manner troughs that correspond the pressure will added sound.

The two sounds will be cancel to from the pressure fluctuations, leading no sound could be reached in ear.