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1. Introduction
When
two sound waves with different but close frequencies interfere with
each other, what is heard is a sound whose frequency is the average
of the two original frequencies. This sound varies in intensity
and the variations in intensity have a frequency that is equal to
the difference between the two original frequencies.
If the original
waves are:
Where f1 and f2
are the frequencies, then the composite wave will be of the form:
In
this experiment we explore the form of the composite wave by viewing
the readings of a microphone and by looking at the Fourier transform
of these readings.
2.
Equipment List
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Datalogger
interface connected to a PC |
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Two tuning forks mounted on sounding boxes (frequencies: 440Hz, 435Hz) |
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A rubber hammer to sound the forks |
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Sound sensor |
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