TUTORIAL QUESTIONS 240-270

 

  
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Questions:
275. Filtered wave
276. Filtered wave
280. Spectra of standing and traveling waves
 
 

275.  A complex traveling sound wave is passed through a filter that removes certain of the constituent sinusoidal frequencies that make up the complex wave.  The resulting filtered wave will always have a different repeat frequency than the original complex wave.

a) True
b) False

Fundamentals of Sound reference:Sec. 7-E.
 
 
 

276. A wave having the following frequency spectrum is passed through a filter that removes all components below 51 Hz. What is the repeat frequency of the resulting complex wave.

       

a) 20 Hz
b) 40 Hz
c) 51 Hz
d) 60 Hz
 
Fundamentals of Sound reference:Sec. 7-E.
 
 
 

280.  The first complex wave below is on a string tied at both ends, while the second complex wave below is a traveling complex wave on a string.  The two waves have the same repeating shape.

The frequency spectrum of these two waves would be identical.
a) True
b) False

Fundamentals of Sound reference:Sec. 7-F.

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