physics
posted by Ericahelp! .
Resonance of sound waves can be produced within an aluminum rod by holding the rod at its midpoint and stroking it with an alcoholsaturated paper towel. In this resonance mode, the middle of the rod is a node while the ends are antinodes; no other nodes or antinodes are present. What is the frequency of the resonance if the rod is 1.30 m long?

physics 
bobpursley
I never found it necessary to soak the towels.
the rod is 1/2 wavelength, so wavelength=2.6m
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