Formula for sound dissipation in air?by Ralphonsicus Tags: dissipation, medium, physics, sound, waves 

#1
Feb2812, 04:08 PM

P: 47

Is there an equation that deals with the dissipation of sound waves in air? As in, how much they die out with distance, because we know they must, otherwise you could hear me talking now!




#2
Feb2812, 05:29 PM

P: 84

The intensity is inversely proportional to the radius squared.
That is, if a certain source has a power P and it emits pressure waves spherically, the intensity I you'll hear is [tex]I = \frac{P}{4\pi r^2}[/tex] 



#3
Feb2912, 05:47 AM

Sci Advisor
PF Gold
P: 11,396

There is also some absorption, which depends on frequency (proportional to frequency squared) and humidity. This produces an attenuation which is proportional to distance (as opposed to inverse square law). Both effects occur at the same time.
See this link. 


Register to reply 
Related Discussions  
What is the formula for sound refraction?  General Physics  25  
formula of doppler effect for sound,relativistic?  Special & General Relativity  17  
Speed of Sound  General Formula  General Physics  4  
Use of formula in sound engineering  Engineering, Comp Sci, & Technology Homework  17  
Electricity Power dissipation formula question  Introductory Physics Homework  2 