A police siren emits a sinusoidal wave with frequency 300 Hz. The speed of sound is 340 m/s. (a) Find the wavelength of the waves if the siren is at rest in the air. (b) If the siren is moving at 30 m/s (108 km/h, or 67 mi/h), find the wavelengths of the waves in front of and behind the source.

A police siren emits a sinusoidal wave with frequency 300 Hz. The speed of sound is 340 m/s. (a) Find the wavelength of the waves if the siren is at rest in the air. (b) If the siren is moving at 30 m/s (108 km/h, or 67 mi/h), find the wavelengths of the waves in front of and behind the source.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

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.

Question

A police siren emits a sinusoidal wave with frequency 300 Hz. The
speed of sound is 340 m/s. (a) Find the wavelength of the waves if the
siren is at rest in the air. (b) If the siren is moving at 30 m/s (108 km/h,
or 67 mi/h), find the wavelengths of the waves in front of and behind
the source.

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