TUTORIAL ANSWERS 275-280

 

 
 

Your Answer to Q275.  Sorry, your answer is not correct. You need to know what a filter does and what establishes the repeat time.

Help: Fundamentals of Sound, Sec. 7-E.

Or would you like a HINT?

You should try to work out the answer on your own, but the correct answer is here .

Return to Question 275.

 

 

Hint for Question 275:  Consider an example, such as a case where the wave consists of all harmonics and the filter removes only the fundamental.
 
Return to Question 275.

 


 

Your Answer to Q275. Congratulations, your answer is correct.

If you would like, you can compare your answer to the "official" correct answer .

Return to Question 275.

 

Correct Answer to Question 275:  Consider an example, such as a case where the wave consists of all harmonics and the filter removes only the fundamental. In this case the repeat time continues to be the period of the fundamental even though the fundamental is now missing because the fundamental frequency is still the greatest common factor of all the frequencies. So the statement is false.

Return to Question 275.

 

 

Your Answer to Q276.  Sorry, your answer is not correct.  What frequencies are left in the spectrum?

Help: Fundamentals of Sound, Sec. 7-E.

Or would you like a HINT?

You should try to work out the answer on your own, but if you insist on reading it the correct answer is here .

Return to Question 276.

 

 

Hint for Question 276:  After the filter acts the frequencies remaining are the 60, 100, and 140 Hz components. What is the repeat frequency for those?
 
Return to Question 276.

 


 

Your Answer to Q276. Congratulations, your answer is correct.

If you would like, you can compare your answer to the "official" correct answer .

Return to Question 276.

 

Correct Answer to Question 276:  After the filter acts the frequencies remaining are the 60, 100, and 140 Hz components. The greatest common factor of those frequencies is still 20 Hz, which is the repeat frequency. The correct answer is a).

Return to Question 276.

 

 

Your Answer to Q280.  Sorry, your answer is not correct.  How do you build a particular shape in space out of sinusoidal waves?

Help: Fundamentals of Sound, Sec. 7-F.

Or would you like a HINT?

You should try to work out the answer on your own, but if you insist on reading it the correct answer is here .

Return to Question 280.

 

 

Hint for Question 280:  Fourier analysis is the theory that tells you how to build a particular shape wave out of sinusoidal waves. You might review the section referenced under help.
 
Return to Question 280.

 


 

Your Answer to Q280. Congratulations, your answer is correct.

If you would like, you can compare your answer to the "official" correct answer .

Return to Question 280.

 

Correct Answer to Question 280:  To build the same shape requires the same sinusoidal waves. The waves needed to build a standing complex wave are standing and the ones needed to build the traveling wave will be traveling. However, the frequency spectrum will be the same.

Return to Question 280.

 

 
 

 


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