Oscillations
and Waves > Instruments > Air Columns
DCS#
3D30.xx
PRESSURE VARIATION
IN
CYLINDRICAL RESONATOR
APPARATUS
1.2 m brass tube
202-06-C
speaker
202-07-E4
HP audio generator
202-08-G
Radio Shack amplifier
202-09-B
condenser microphone on a stick
202-06-C
oscilloscope with video camera
202
DESCRIPTION
Tune the oscillator to a resonance
frequency of
the cylinder and move the microphone along the axis of the cylinder to
show alternating
pressure nodes and antinodes.
NOTES
Microphone requires 3 AA batteries
which should
be removed after use, as it has no on/off switch.
Clip a lead from the scope ground to the cart to eliminate 60 Hz
interference.
There is also a shorter but
transparent plexiglas
tube.
