Susan stands on the side of the road and observes a fire truck driving at 35 m/s. The truck turns on its siren, which has a frequency of 15,000 Hz. Assume the speed of sound is 340 m/s. a. What frequency will Susan hear as the fire truck drives directly toward her? b. What frequency will Susan hear as the fire truck drives directly away from her?

College Physics
10th Edition
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter14: Sound
Section: Chapter Questions
Problem 1CQ: (a) You are driving down the highway in your car when a police car sounding its siren overtakes you...
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Susan stands on the side of the road and observes a fire truck driving at 35 m/s. The truck turns on its siren, which has a frequency of 15,000 Hz. Assume the speed of sound is 340 m/s.

a. What frequency will Susan hear as the fire truck drives directly toward her?

b. What frequency will Susan hear as the fire truck drives directly away from her?

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