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# Bystander hears a siren; open organ pipe frequencies

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1. A bystander hears a siren vary in frequency from 476 Hz to 404 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of the sound in air to be 343 m/s)

2. An open organ pipe is 0.50 m long. If the speed of the sound is 340 m/s, what are the pipe's fundamental frequency and the frequencies of the first two overtones?

##### Solution Summary

An open organ pipe frequencies for bystanders hearing a siren is examined.

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1. A bystander hears a siren vary in frequency from 476 Hz to 404 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of the sound in air to be 343 m/s)
Solution:

Doppler's effect in sound
Doppler's effect is about apparent change in the frequency of sound as observed by an observer when the source of the sound and the observer are moving.

Vs VO

Source of sound V ...

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