Introudction:
The purpose of this experiment is to learn the properties of sound waves by using LabPro and microphone to make recordings of "AAAA" sound. We will obtain sound wave graphs and analyze the graphs to understand the properties of sound waves.
1 "AAA" Sound
a. Yes, this is a periodic wave. From the graph, we can see the wave has repeating pattern.
b. About 2 waves are shown in the sample. One complete wave is from one high peak to the second high peak. In the graph there are three peaks, so there are two waves.
c. The probe collected data as fast as the frames separated on TV.
d. The period of these waves should be 0.01s/wave.
e. The frequency should be 1/T=1/0.01=100Hz
f. lambda=v/f=360/100=3.6m. This can be the length of a table in the classroom.
g. w=2pi*f=2*3.14*100=628rad/s
A=v/w=360/628=0.571m
h. The number of waves would change and be increased. The time it takes to collect the data will increase too. Period, frequency, wavelength, and amplitude wont change.
2. The period is much shorter than the previous more.
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