14. A fire engine is driving EAST at a speed of 29.4 m/s while its siren is blaring a 448 Hz tone. You happen to be driving ahead of the fire engine in the same direction at a speed of 21 m/s. Calculate the frequency you would hear A) as the fire engine approaches you from behind and B) after you pull over and stop and the fire engine passes by and travels ahead of you (you are stopped at this point). Assume that the speed of sound in air is 344 m/s.

14. A fire engine is driving EAST at a speed of 29.4 m/s while its siren is blaring a 448 Hz tone. You happen to be driving ahead of the fire engine in the same direction at a speed of 21 m/s. Calculate the frequency you would hear A) as the fire engine approaches you from behind and B) after you pull over and stop and the fire engine passes by and travels ahead of you (you are stopped at this point). Assume that the speed of sound in air is 344 m/s.

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter13: Mechanical Waves

Section: Chapter Questions

Problem 39P: A driver travels northbound on a highway at a speed of 25.0 m/s. A police car, traveling southbound...

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A driver travels northbound on a highway at a speed of 25.0 m/s. A police car, traveling southbound at a speed of 40.0 m/s, approaches with its siren producing sound at a frequency of 2 500 Hz. (a) What frequency does the driver observe as the police car approaches? (b) What frequency does the driver detect after the police car passes him? (c) Repeat parts (a) and (b) for the case when the police car is behind the driver and travels northbound.
(a) What frequency is received by a person watching an oncoming ambulance moving at 110 km/h and emitting a steady 800—Hz sound from its siren? The speed of sound on this day is 345 m/s. (b) What frequency does she receive after the ambulance has passed?
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