19-9.47) An acoustic burglar alarm consists of a source emitting waves of frequency 28.3 kHz. What will be the beat frequency of waves reflected from an intruder walking at 0.95 m/s directly away from the alarm?

19-9.47) An acoustic burglar alarm consists of a source emitting waves of frequency 28.3 kHz. What will be the beat frequency of waves reflected from an intruder walking at 0.95 m/s directly away from the alarm?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter17: Physics Of Hearing

Section: Chapter Questions

Problem 31PE: (a) At an air show a jet flies directly toward the stands at a speed of 1200 km/h, emitting a...

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Shock Waves

Shock waves are common in continuum mechanics, and their dominance is attributable to the fact that they are stronger (or even less) compressible. Substantial perturbations propagated as sudden dynamic changes of a compressible medium supersonically. Shock waves are all around us in our daily lives. Lightning, earthquakes, volcanic eruptions, and meteorite impact all produce them in nature. Even the earth, which is protected by its magnetic field, generates a shock wave as in solar wind that travels around 20 Earth radiuses. These shock waves might be either constant, linked to the body, or unsteady, i.e., moving around with time. All of the shocks mentioned above can be damaging, so precautions must be taken to reduce their impact.

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19-9.47) An acoustic burglar alarm consists of a source emitting waves of
frequency 28.3 kHz. What will be the beat frequency of waves reflected from an
intruder walking at 0.95 m/s directly away from the alarm?

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