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>>
>> (Oddly though, it doesn't seem to make much audible sound, despite the 
>> ends of the fork traversing really quite some distance. I can only 
>> surmise that it doesn't move the air around very much or something...)
>>
> Perhaps otherwise it would loose energy too fast and the tone would die 
> out quickly.
Think of a big impedance mismatch between the fork and air.
You get a better match when you put the round end on a thin hard surface as 
a guitar top or a box.
Then the vibrating surface is much bigger and can transmit energy to the 
air.
Note that the sound dies faster then.

Marc

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