   Chapter 14, Problem 14P

Chapter
Section
Textbook Problem

A sound wave from a siren has an intensity of 100.0 W/m2 at a certain point, and a second sound wave from a nearby ambulance has an intensity level 10 dB greater than the siren’s sound wave at the same point. What is the intensity level of the sound wave due to the ambulance?

To determine
The intensity level of a ambulance.

Explanation

Given Info: The intensity of a first siren is 100W/m2 and intensity level of a sound wave of a ambulance is 10 dB.

Formula for intensity level due to a first siren,

β1=10log(I1I0)

• I1 is the intensity of a first siren,
• I0 is the reference intensity,

Substitute 100W/m2 for I1 and   1.0×1012W/m2 for I2  in the above expression to get β1 .

β1=10log(100W/m21

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