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[Physltest] [Phys-L] Re: 'Seeing' frequencies above 30-40Hz (fwd)



On Wednesday, Jan 12, 2005, at 15:07 America/New_York, Scott Goelzer
wrote:

Tuning a strobe to nearly match the frequency is always impressive -
show the tuning fork is really moving as it makes the sound.

Did somebody mentioned a large tuning fork with a needle rigidly
attached to one of the prongs? Drag the needle rapidly over a sooty
glass (after keeping glass above a candle flame) without pressing too
much. I remember seeing this somewhere. A wiggly line will be produce.
I suppose a common motion detector can be used to measure the speed at
which the hand holding the fork is moving (for example, 500 millimeters
per second when f=256 Hz).
Ludwik Kowalski
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