# (a) What is the intensity in watts per meter squared of a just barely audible ZUD—Hz sound? (b) What is the intensity in watts per meter squared of a barely audible 4000—Hz sound?

### College Physics

1st Edition
Paul Peter Urone + 1 other
Publisher: OpenStax College
ISBN: 9781938168000

Chapter
Section

### College Physics

1st Edition
Paul Peter Urone + 1 other
Publisher: OpenStax College
ISBN: 9781938168000
Chapter 17, Problem 67PE
Textbook Problem
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## (a) What is the intensity in watts per meter squared of a just barely audible ZUD—Hz sound? (b) What is the intensity in watts per meter squared of a barely audible 4000—Hz sound?

To determine

(a)

What is the intensity in watts per meter squared of a just barely audible 200-Hz sound?

### Explanation of Solution

Given info:

f=200Hz

Formula used:

Sound intensity level in units of decibels (dB) is

β(dB)=10log10(II0),I0=1012W/m2 is the threshold intensity of hearing.

Calculation:

From graph for 200Hz and 0 phon,

Sound level = 23 dB

Substituting,

23=10log10(I 10

To determine

(b)

What is the intensity in watts per meter squared of a barely audible 4000-Hz sound?

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