Oscillations and Waves > Waves > Interference and Diffraction

DCS# 3B55.10

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INTERFERENCE OF SOUND WAVES

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APPARATUS

function generator	202-08-G
amplifier	202-09-B
two speakers	202-07-F

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DESCRIPTION

Students walk around the room listening to the variation in the amplitude of the sound as they pass through the nodes and antinodes of the interference pattern produced by the two speakers.

NOTES

Set speakers about a meter apart.

Set function generator to about 1.5 kHz.

A microphone and oscilloscope can be used to display the variation in sound intensity.  A laptop with the soundcard scope program can be used in place of an oscilloscope.