"Suppose that a tuning fork is mounted on a sound box and set upon the table; and suppose a second tuning fork/sound box system having the same natural frequency (say 256 Hz) is placed on the table near the first system. Neither of the tuning forks is vibrating. Then the first tuning fork is struck with a rubber mallet and the tines begin vibrating at its natural frequency - 256 Hz. These vibrations set the sound box and the air inside the sound box vibrating at the same natural frequency of 256 Hz. Surrounding air particles are set into vibrational motion at the same natural frequency of 256 Hz and every student in the classroom hears the sound. Then the tines of the tuning fork are grabbed to prevent their vibration and remarkably the sound of 256 Hz is still being heard. Only now the sound is being produced by the second tuning fork - the one which wasn't hit with the mallet. Amazing!! In fact, it is so amazing, that the demonstration is repeated to assure that the same surprising results are observed. They are! What is happening? "
from http://www.physicsclassroom.com/Class/sound/U11L4b.html
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3 comments:
and what happens when we can no longer hear it? is this not simply a limitation of freuqency reception by our simple but elegant choclea? doesn't that sound keep on going, up and out and around, maybe on into the space the way light travels for millions of years? or does it dissperse, matter as much as matter can or is, and what effect, unseen perhaps does it have on those whom it settles on?
"every illumination, every vibration
sings creation
the harmonics of faith and history
etched in the soul
of every living link in the chain
we are bound"
Yes, I do believe they go on in the endless exchange of energy. I would add this to your lovely poem if I can be so bold...
And when sound becomes silence to the ear
It is replaced by memory and faith
and sometimes fear
huh. here is where you can see two tuning forks is a damn good analogy. the whole poem is posted in my blog. had you not read it?
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