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From: larry@kitty.UUCP (Larry Lippman)
Newsgroups: rec.audio,sci.physics,sci.electronics
Subject: Re: Mercury Filled Speaker Wire
Message-ID: <2032@kitty.UUCP>
Date: Wed, 23-Sep-87 14:01:57 EDT
Article-I.D.: kitty.2032
Posted: Wed Sep 23 14:01:57 1987
Date-Received: Sat, 26-Sep-87 03:39:53 EDT
References: <1549@culdev1.UUCP> <1130@hounx.UUCP>
Organization: Recognition Research Corp., Clarence, NY
Lines: 24
Summary: Look alive, people!
Xref: mnetor rec.audio:3394 sci.physics:2257 sci.electronics:1406

In article <1130@hounx.UUCP>, jong@hounx.UUCP (J.LEE) writes:
> > As long as we're debunking things, note that the "skin effect" (if
> > it's the skin effect I know and love) involves a "penetration depth"
> > measured in fractions of a wavelength.  Since the wavelength at 20kHz
> > is ... hmmm ... 5 kilometers, it doesn't seem too significant.
> 
> The wave length of 20 K Hz tone is 5 kilometers???
> Nah.  The velocity of sound is about 300 m/s at room temperature.
> This makes the wave length of 20 KHz sinusoid 0.015m (=300/20k)
> or 1.5 cm (~0.6 in). Granted, this is still much larger than
> most audio conductor diameter. As to whether this causes audible
> phase dispersion or not, I am still not sure.  I am still experimenting...

	Uh, we are talking about ELECTRICAL propagation of signals in
the 20 kHz frequency range.  So we are talking about velocities around
the speed of light, which is roughly 300,000,000 meters/sec.  So the
electrical wavelength of a 20 kHz signal is approximately 15 km long.
	SOUND propagates at roughly 300 meters/sec IN AIR at room
temperature.  We are not talking about sound propagation in copper wire!

<>  Larry Lippman @ Recognition Research Corp., Clarence, New York
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