Since it is the back and forth motion of the card and not the tapping of
the spokes on the card* that make the pitch go higher, I find it more
illuminating to apply a signal generator to a speaker cone (or to a
solenoid with a bar magnet placed inside). That requires special
equipment but nothing more special than you'd find in a university lab.
*With the wheel and card, I get students who think they can hear sounds
below 30-40 Hz.
____________________________________________________
Robert Cohen; 570-422-3428; www.esu.edu/~bbq
East Stroudsburg University; E. Stroudsburg, PA 18301
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