*113. ssm A siren, mounted on a tower, emits a sound whose fre- quency is 2140 Hz. A person is driving a car away from the tower at a speed of 27.0 m/s. As the figure illustrates, the sound reaches the person by two paths: the sound reflected from the building in front of the car, and the sound coming directly from the siren. The speed of sound is 343 m/s. Concepts: (i) One way that the Doppler effect can arise is that the wave- length of the sound changes. For either the direct or reflected sound, does the wavelength change? (ii) Why does the driver hear a frequency for the reflected sound that is different from 2140 Hz, and is it greater or smaller than 2140 Hz? (iii) Why does the driver hear a frequency for the direct sound that is different from 2140 Hz, and is it greater or smaller than 2140 Hz? Calculations: What frequency does the person hear for the (a) reflected and (b) direct sound? Direct Reflected

*113. ssm A siren, mounted on a tower, emits a sound whose fre- quency is 2140 Hz. A person is driving a car away from the tower at a speed of 27.0 m/s. As the figure illustrates, the sound reaches the person by two paths: the sound reflected from the building in front of the car, and the sound coming directly from the siren. The speed of sound is 343 m/s. Concepts: (i) One way that the Doppler effect can arise is that the wave- length of the sound changes. For either the direct or reflected sound, does the wavelength change? (ii) Why does the driver hear a frequency for the reflected sound that is different from 2140 Hz, and is it greater or smaller than 2140 Hz? (iii) Why does the driver hear a frequency for the direct sound that is different from 2140 Hz, and is it greater or smaller than 2140 Hz? Calculations: What frequency does the person hear for the (a) reflected and (b) direct sound? Direct Reflected

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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