Experiment Sh-01
Wavelegnth of Sound In Air
Description: An
oscillator and amplifier are used to drive a speaker. The input to the speaker
is coupled to one input of a dual trace oscilloscope. A microphone in front
of the speaker is coupled to the second oscilloscope input, so that two sine
aves appear on the face of the oscilloscope. The microphone os then moved away
from the speaker until the two sine waves show a phase change corresponding to
one wavelegnth. The distance that the microphone moved is one wavelegnth. The
phase velocity of the wave is the measured wavelegnth multiplied by the frequency.
Several different frequencies can be used to illustrate that the phase velocity
is constant.
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Friday August 15, 2008 8:37 PM