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56b
Problem

Problem 56b

Page 356

Section: Problems

Chapter 12: Sound

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10 Nov 2021

Given information

A fire truck's siren has the following frequency:

   

The observer's speed is:

   

Speed of sound:

   

Is an observer moving toward a stationary source?

Step-by-step explanation

Step 1.

According to the Doppler Effect, the frequency of a sound heard by an observer rises as the observer moves closer to the source, and drops as the observer moves away from the source.

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