Right you are JB. I was describing the "electrical signal" wavelength (like
a stupid stooge).
Larry H
BTW, that reminds me of a question a friend of mine (guitar player) asked me
in high school. I was always the technical guy in the band. But, this guy
was a real musician and knew the value of a good delay. He want to know if
he took a lot of wire and rolled it up inside his speaker cabinet if he
could get a delay. I said, well not much delay or a LOT of wire. I got a
good chuckle out of that one.
----- Original Message -----
From: <jwbarlow@...>
To: <motm@egroups.com>
Sent: Sunday, January 07, 2001 11:09 AM
Subject: Re: [motm] OT: More of Nate's Stupidity
In a message dated 1/6/2001 7:26:25 PM, jlarryh@... writes:
>AM
>broadcast radio frequencies are in the hundreds of feet.
Yeah, but radio waves travel a bit faster than sound waves (now who's the
Stooge!).
>So, audio would
>be
>MANY times that.
Just off the top of my head I think the speed of sound (at room temp and
near
sea level) would be about 750 mph. And 750 mph = about 1100 fps (given
750/3600 = 0.208 mps and 0.208 ∗ 5280 = 1100 fps). So a 1 Hz "tone" would
have a wavelength of 1100 feet and a 2 Hz "tone" would have length of 550
feet. So a 20 Hz tone would have a wavelength of about 55 feet and a 30 Hz
tone (only half way up the first octave of good human hearing) would be
about
36.7 feet.
Now a "fun" experiment:
Put a 1.1 KHz sine wave through your stereo monitoring system (or stereo for
that matter) which will have a wavelength of about one foot. It needs to be
a
bit loud (I mean not quiet). Now, slowly walk around the room (or slowly
move
your head around) and you'll hear the peaks and troughs of the sound
pressure
waves.
So Wavelength = velocity of sound (in the given medium)/ frequency
JB