Oscillations and Waves > Instruments > Plates, Bars
and Solids >
Bars
DCS#
BRASS CHIMES
APPARATUS
brass pipes/chimes
202-06-C
wrench
202-02-F1
hammer or mallet
202-02-F2
DESCRIPTION
Shows that resonant frequencies
for transverse waves are f1, 2.76f1, 5.41f1.
Tap in
middle, you get mainly fundamental. Tap near end with middle
held, you
get second mode which is about an octave and a 4th above
fundamental. Fundamental frequencies of 3 shorter tubes are about
a major 3rd, a perfect 5th, and double octave above longer tube's pitch
- illustrating 1/L2 rule.