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Questions:
240. Pitch of sound waves
250. Most likely spectrum
255. Repeat time
260. Repeat time compared to period of fundamental
270. Repeat frequency
240. The frequency spectra of six complex waves are shown below. Which waves would you perceive to have the same pitch as I) if they were played over a loud speaker?
a)
III and V would have the same pitch as I.
b) All would have the same pitch as I.
c) Only V has the same pitch as I.
d) Only IV has the same pitch as I.
e) None of the sounds would have the same
pitch as I.
Fundamentals of Sound
reference:Sec. 7-D.
250.Which frequency spectrum below most likely corresponds to the following standing complex wave on a string tied at both ends?
Fundamentals of Sound
reference:Secs. 7-B.
255. What is the repeat time of a complex wave made up by adding together (by superposition) the three sinusoidal waves having frequencies 18 Hz, 24 Hz, and 60 Hz?
a)
6 seconds
b) 18 seconds
c) 34 seconds
d) 1/34 second
e) 1/6 second
f) 1/18 second
Fundamentals of Sound
reference:Secs. 7-D.
260. The repeat time of any complex wave on a string tied at both ends is always equal to, or less than the period of the fundamental.
Fundamentals of Sound
reference:Secs. 7-D.
270. Below is a frequency spectrum of a complex standing wave on a string tied at both ends. The allowed normal modes on the string form the harmonic series, {5 Hz, 10 Hz, 15 Hz, ...}.
What
is the repeat frequency of this complex wave?
Fundamentals of Sound
reference:Sec. 7-D.