Oscillations and Waves > Instruments > Air Columns DCS# 3D32.25
PRESSURE VARIATION IN OPEN AND CLOSED CYLINDERS
APPARATUS
clear plexiglass tube 113-03-B
speaker 202-07-E4
HP function generator 202-08-G
Radio Shack amplifier 202-09-B
wireless microphone
 202-06-D
receiver for wireless microphone
 202-09-D
pointer
 202-06-D
oscilloscope with video camera 202
DESCRIPTION
With the function generator set to a resonance frequency of the cylinder, move the microphone along the axis of the cylinder to show alternating pressure nodes and anti-nodes.

For a closed tube, use the wooden stopper (113-03-B).