Equipment:
- LabPro
- Microphone
- Singers(Students)
Experiment:
The experiment collected a 0.03 second recording of an "AAAAAAAA" from a students, a much more harmonic turning fork striking a soft surface.
The following questions were proposed and asked to be answered for all Parts A thru D
Part B Specific:
Have someone else speak into the microphone and compare and contrast the two graphs.
Part C Specific:
Then use a tuning fork to produce a graph and compare and contrast that graph against the human graphs.
Part D Specific:
What would you expect if the tuning fork wasn't as loud as the first time?
The following questions were proposed and asked to be answered for all Parts A thru D
1)
Would you say this is a
periodic wave? Support your answer with
characteristics.
2) How many waves are shown in this sample? Explain how you determined this
number.
3) Relate how long the probe collected data to
something in your everyday experience. For example: “Lunch passes by at a snails
pace.” Or “Physics class flies by as fast as a jet by the
window.”
4)
What is the period of
these waves? Explain how you determined
the period.
5) What is the frequency of these waves? Explain how you determined the
frequency.
6) Calculate the wavelength assuming the speed of
sound to be 340 m/s. Relate the length of the sound wave to something in the
class room.
7)
What is the amplitude of
these waves? Explain how you determined
amplitude.
8) What would be different about the graph if the
sample were 10 times as long? How would your answers for the questions a-g
change? Explain your thinking. Change the sample rate and test your ideas. Copy
the graph and label it #1h.
Part B Specific:
Have someone else speak into the microphone and compare and contrast the two graphs.
Part C Specific:
Then use a tuning fork to produce a graph and compare and contrast that graph against the human graphs.
Part D Specific:
What would you expect if the tuning fork wasn't as loud as the first time?
 |
| "My beutiful Voice" by Jose Comi |
1)
This wave is periodic since it repeats similar
to a sinusoidal wave.
2)
5.4 waves are in this sample.
3)
The data was collected over 0.03 seconds which
is faster than you blink.
4)
The period of the wave is 0.0056 seconds. We determined this by dividing the sample
time (0.03) by the number of waves (5.4).
5)
The frequency is 180 Hz. We determined this by 1/T and confirmed it by
extrapolating 5.4 waves in .03 seconds and looked at how many waves in one
second (frequency).
6)
The wavelength equals velocity divided by the
frequency. (340m/s) / (180 s-1)
= 1.89m. This is about the length of a desk.
7)
The amplitude is 1.8 units. We determined this from the graph.
8)
Everything would be the same except you would
have more waves in the sample.
Part B:
 |
| "The sound of aerospace" - Jason Shaw |
1)
The second wave sampling was not as regular as
the first. There are 3.5 waves in the
sample which is 0.03 seconds. The period
is 0.0086 seconds. The frequency of the
wave is 116 Hz. The wavelength is 2.93
m. The amplitude is 0.75 units.
Part C:
The tuning fork produces a much more uniform sound wave
compared to the human waves. There are
15 waves in the sample of 0.03 seconds.
The period is 0.0020 seconds. The
frequency of the wave is 500 Hz. The
wavelength is 0.68 m. The amplitude is
0.23 units.
Part D:
Only the amplitude of the wave changed (decreased) while the
other data remained the same. We changed
the impact surface to a softer material (skin/pants vs rubber shoe sole) which
resulted in a softer wave.
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