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Old 06-01-2003, 02:51 AM   #1
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It's official #echo

ever notice, late at nite when no one is around that there's quite an echo in here?








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Old 06-01-2003, 02:52 AM   #2
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see what I mean?
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Old 06-01-2003, 02:54 AM   #3
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hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeellllllllllllllllllllllllllllllllllllllllllllll lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
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Old 06-01-2003, 02:57 AM   #4
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God ABEL... for real..
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Old 06-01-2003, 02:59 AM   #5
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a duck's quack never echos...I never knew that before
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Old 06-01-2003, 03:03 AM   #6
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Sound travels about 300 metres in one second
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Old 06-01-2003, 03:06 AM   #7
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what causes an echo?

1. The sound must travel a fair distance. We're suggesting at least 75 m, although you can hear echos from shorter distances under the right conditions.

2.The sound must be able to bounce back. It must hit a flat smooth surface somewhere.

3. All other sounds must be absorbed.

4. There must be amplification of the sound, by having more than one smooth surface to bounce it back to you.
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Old 06-01-2003, 03:46 AM   #8
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Echolocation:

Bats can find their way in total darkness using an echo system called echolocation. It works by sending out high pitched pulses of sound that bounce back as it echos off nearby objects.
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Old 06-01-2003, 03:56 AM   #9
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Reflection occurs when the sound wave bounces back from an object in its path. There are two factors which govern the amount of reflection from a surface. The first is the absorption of the surface. The more sound a surface absorbs, the less will be reflected. The second factor is the size of the object. Reflection only occurs if the dimensions of the reflecting surface are relatively large compared with the wavelength of the sound wave. Typically, objects which have dimensions of less than 1/3 of the sound wavelength have minimal reflection (regardless of surface absorption).


For example, for a rigid 1mX 1m board, perpendicular to a sound wave

when f < 100 Hz ( wavelngth > 3m) - no reflection
when f = 300 Hz ( wavelength approximately 1m) - partial reflection
when f > 1 kHz ( wavelength < 0.33m) - total reflection
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Old 06-01-2003, 03:59 AM   #10
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Sound is a mechanical wave which travels through a medium from one location to another. This motion through a medium occurs as one particle of the medium interacts with its neighboring particle, transmitting the mechanical motion and corresponding energy to it. This transport of mechanical energy through a medium by particle interaction is what makes a sound wave a mechanical wave.

As a sound wave reaches the end of its medium, it undergoes certain characteristic behaviors. Whether the end of the medium is marked by a wall, a canyon cliff, or the interface with water, there is likely to be some transmission/refraction, reflection and/or diffraction occurring. Reflection of sound waves off of barriers result in some observable behaviors which you have likely experienced. If you have ever been inside of a large canyon, you have likely observed an echo resulting from the reflection of sound waves off the canyon walls. Suppose you are in a canyon and you give a hollar. Shortly after the hollar, you would hear the echo of the hollar - a faint sound resembling the original sound. This echo results from the reflection of sound off the distant canyon walls and its ultimate return to your ear. If the canyon wall is more than approximately 17 meters away from where you are standing, then the sound wave will take more than 0.1 seconds to reflect and return to you. Since the perception of a sound usually endures in memory for only 0.1 seconds, there will be a small time delay between the perception of the original sound and the perception of the reflected sound. Thus, we call the perception of the reflected sound wave an echo.
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Old 06-01-2003, 06:59 AM   #11
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interesting
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Old 06-01-2003, 07:01 AM   #12
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if I may coin a phrase
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Old 06-01-2003, 07:16 AM   #13
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You may not.


I suggest we allow a new category in IO, exclusively for ABEL. Instead of It's Official#, ABEL can now use I'm Bored#.

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Old 06-01-2003, 07:47 AM   #14
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I didn't know most of what has been written in this thread
because it was too much text I didn't read and so I still don't know this though
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Old 06-01-2003, 07:48 AM   #15
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Did I wander into science class by mistake?
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Old 06-01-2003, 08:10 AM   #16
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Nah, we all just wandered into ABEL's mind, Fizz.

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Old 06-01-2003, 09:34 AM   #17
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echo
and narcissus
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Old 06-01-2003, 10:39 AM   #18
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Quote:
Originally posted by Angela Harlem
Nah, we all just wandered into ABEL's mind, Fizz.








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Old 06-01-2003, 01:54 PM   #19
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Abel is turning IO into:

It's a Litter box #

and

I'm Bored #

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Old 06-01-2003, 01:55 PM   #20
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hold me. i'm scared.
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