A 25 W speaker emits sound isotropically. What is the sound intensity level at a distance of 32 m? Save for Later dB Submit Answer

College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter17: Physics Of Hearing
Section: Chapter Questions
Problem 64PE: (a) What are the loudnesses in phons of sounds having frequencies of 200, 1000, 5000, and 10,000 Hz....
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16.8 Decibels
A 25 W speaker emits sound isotropically. What is the sound intensity level at a distance of 32 m?
i p4
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Transcribed Image Text:16.8 Decibels A 25 W speaker emits sound isotropically. What is the sound intensity level at a distance of 32 m? i p4 Save for Later dB Submit Answer
4
6.8
P: 25
D: 32m
Io: 10-12 W/m ² -> The shold of Hearmmy
2 -7
P
I=
4πTr²
3 = (1043) log ( = ² )
25W
ЧПС 32)2
-> .001943 w/m²
->
I
3 = 10 109 10 10-1² W/m²
B = 10 log 10
->
B = 10 log₁0 (
·001943 W/m²
10-12
W/m²
001943
10-12 W/m²
Transcribed Image Text:4 6.8 P: 25 D: 32m Io: 10-12 W/m ² -> The shold of Hearmmy 2 -7 P I= 4πTr² 3 = (1043) log ( = ² ) 25W ЧПС 32)2 -> .001943 w/m² -> I 3 = 10 109 10 10-1² W/m² B = 10 log 10 -> B = 10 log₁0 ( ·001943 W/m² 10-12 W/m² 001943 10-12 W/m²
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