?A Graphical Analysis of Sound Waves
A Graphical Analysis of Sound Waves In order to study wave properties of sound, you will analyze a graph between amplitude and its corresponding distance.
For this assignment, you will use the Unit I Assignment template located here. (Attached Document) The following video provides the instructions for this assignment:
uniti_assignmenttemplate.docx
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A little girl plays on a piano. When she strikes a key, a sound wave travels through her
room. She presses four different single keys one by one and the graphical representations
of the sound waves are shown below from Plot A to Plot D. You can examine the detailed
graphical features by clicking here for a pdf file named Plot A to D. After analyzing the
individual graphs to obtain physical properties of waves from Plot A to Plot D, complete
the Table and answer the following questions.
Instructions
for
this
activity
are
given
by
the
YouTube
video
(https://www.youtube.com/watch?v=mSsvABvYo70) and the PowerPoint presentation.
Complete the Table: Calculate the amplitude, wavelength ? , frequency f , and
period T for each plot. When you caculate frequency, use v=f?, where v is the
sound of speed at room temperatue, v = 340 m/s. (50 points)
Plot
A
B
C
D
Amplitude
?[m]
f [Hz]
T [sec]
1. What is the physical condition to make Plot A equal to Plot B?
(6 points)
2. If the wavelength of Plot B is doubled, which plot has the same property? (6
points)
3. When the frequency of the sound doubles, it has a one-octave high pitch. How
many more octaves is Plot C compared to Plot D? (6 points)
4. Which two plots have the same period to complete one cycle of oscillation? (6
points)
5. If the pitch of Plot D increased by one octave and the amplitude decreased by
half, which plot does Plot D become? (6 points)
6. When you tune the piano, you change the tension (tightness) by tightening or
loosening the string in order to get the proper wavelength on the string. If you
strengthen the tension of a string, what would you expect the change of the sound
to be when you hit the string and why? (5 points) Please describe where you have
seen this phenomenon at work in either your personal or professional life. (5 points)
Your response must be at least 75 words. No references or citations are
necessary.
7. The speed of the sound depends on the pressure, density, and the temperature of
the environment. Suppose the speed of the sound increases from 340 m/s to 350
m/s on one hot humid summer day. What would you expect a piano sound to sound
like when you hit a key compared to the day of normal clear weather, and why? (5
points)? Please describe the typical weather conditions where you live and how
those conditions might affect a piano player in your community. (5 points)
Your response must be at least 75 words. No references or citations are
necessary.
…
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