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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, f2 are the frequencies, than 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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Data logger interface connected with PC |
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Two tuning forks mounted on sounding boxes (frequencies:
440 Hz, 435 Hz) |
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A rubber hammer to sound the forks |
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Sound sensor |
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