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[Phys-L] Singing Rod Demo....



Some other physics teacher and I were recently debating the singing rod demo
where an aluminum rod resonates after stroking it with fingers rubbed in
rosin.

The debate was about whether the standing waves created were transverse or
longitudinal. My gut feeling is the waves are longitudinal based on the
manner in which the metal rod is stroked. Another teacher strongly believed
that the waves must be transverse because the impressive volume of the sound
is too great to be achieved longitudinally.

What do the rest of you think? Is there a compelling test or evidence to
prove what type of wave it is?

Thanks,
Ralph von Philp
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