TUTORIAL ANSWERS 185-187

 
 
 
 


 

Your answer to Q185:  Sorry, your answer is not correct. 

Help: Fundamentals of Sound, Chap. 5-A.

Or, would you like a HINT?

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

Return to Question 185.
 


 

Hint for Q185:  You could use the formula I=I0(R0/R)2, but you have to understand what that means, of course. The intensity is proportional to the square of the distance, not just to the distance.

    Return to Question 185

 
 

Your answer to Q185:  Congratulations, your answer is correct!

    To read the "official" correct answer, click HERE.

    Return to Question 185.
 


 

Correct answer to Q185:  The intensity falls off as the square of the distance. Thus if the distance is twice as far, as it is here (100/50 = 2), the intensity is 1/22 = 1/4 times as much. Since(0.08 W/m2)/4=0.02 W/m2, the answer is e).

    Return to Question 185.
 
 
 
 
 

Your answer to Q187:  Sorry, your answer is not correct.

Help: Fundamentals of Sound, Chap. 5-A.

Or, would you like a HINT?

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

Return to Question 187.
 


 

Hint for Q187:  You could use the formula I=I0(R0/R)2, but you have to understand what that means, of course. The intensity is proportional to the square of the distance, not just to the distance.

    Return to Question 187.

 
 

Your answer to Q187:  Congratulations, your answer is correct!

    To read the "official" correct answer, click HERE.

    Return to Question 187.
 


 

Correct answer to Q187:  The intensity changes as the square of the distance. Thus, if the distance is three times closer, as it is here (60/20 = 3), the intensity is 32 = 9 times as much. Since 0.09x9=0.81 W/m2, the answer is a).

    Return to Question 187.
 
 
 

 
 


 

 


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