[Vintage-Audio] Re Frequency Behavior

[Duane Fischer, W8DBF]

This fails to take into account the altitude variant which is a factor in
determining the density of said particles. There is a median above and below sea
level. Additionally, the velocity factor is also affected by the temperature at
the source and reception points, plus any inversions in between. Further, the
effect of inner space and interplanetary gravitational fields must be factored
in to the equation to calculate the true velocity. Which as you have stated is
only an approximation at best. Theoretical and applied physics aside, I will put
my money on an angry female being heard at a greater distance than any male!
Your bets, gentlemen?  	
  

----------
From: Peter Markavage <manualman@juno.com>
To: vintage-audio@mailman.qth.net
Subject: Re: [Vintage-Audio] Re Frequency Behavior
Date: Monday, January 12, 2004 6:27 PM

The speed of a sound wave at 0 degrees C is 331 meters/sec.  
The speed of a sound wave in air depends upon the properties of the air,
namely the temperature and the pressure not the frequency. The pressure
of air (like any gas) will effect the mass density of the air (an
inertial property) and the temperature will effect the strength of the
particle interactions (an elastic property). At normal atmospheric
pressure, the temperature dependence of the speed of a sound wave through
air is approximated by the following equation:
v = 331 m/s + (0.6 m/s/C)*T
where T is the temperature of the air in degrees Celsius. 
Example: Using this equation is used to determine the speed of a sound
wave in air at a temperature of 20 degrees Celsius yields the following
solution.
v = 331 m/s + (0.6 m/s/C)*T 
v = 331 m/s + (0.6 m/s/C)*20 C
v = 331 m/s + 12 m/s
v = 343 m/s  Speed of sound at 20 degrees C.
Pete, WA2CWA
On Mon, 12 Jan 2004 15:26:49 -0500 "Duane Fischer, W8DBF"
<dfischer@usol.com> writes:
> 
>         
> Is it true that a higher note is often easier to hear, but a lower 
> note travels
> a greater distance? 
> 
> Now leaving the length of the sound wave out of the discussion 
> momentarily,
> given a male and a female announcer for a radio station, speaking at 
> the same
> volume into the same mike, which signal will be heard at the 
> greatest distance?
> The one with the highest voice pitch or the one with the longest 
> wave length?        
>         
> Duane W8DBF        

--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment.  Attachments are not allowed.  To learn how
to post in Plain-Text go to: http://www.expita.com/nomime.html  ---
_______________________________________________
Home: http://mailman.qth.net/mailman/listinfo/vintage-audio
List Administrator: Duane Fischer, W8DBF
** For Assistance: dfischer@usol.com **