andrel wrote:

>> Oh... no, not really. I mean, sound vibrations are really, *really* 
>> tiny. (Think about it; even when the sound is turned up painfully 
>> loud, the speaker cones move by such a tiny amount you can't even see 
>> them move at all!)
>>
> have you taken into account that the overlap in frequency resolution of 
> your ears and eyes is very small? You can not hear anything below 20 Hz
> or see anything above 50 Hz.

And when I start up the engine of my car, the various parts move far too 
fast for the eye to follow. But you *can* see the blur of moving 
objects, and there is little doubt that they're moving. ;-)

>> Also, 49.97 Hz. (So much for "they keep it to exactly 50 Hz to help 
>> all those clocks that use it". The frequency waivers all over the place!)
>>
> RTFM The instantaneous frequency (how is that for an oxymoron) may vary, 
> but there will be exactly 432000 cycles in a day.

Behold: Differential calculus. ;-)

-- 
http://blog.orphi.me.uk/

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