Properties of Rifle Sound

  • Thread starter tdk
  • Start date
  • #1
tdk
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Homework Statement



"A rifle is fired in a valley with parallel vertical walls. The echo from one wall is heard 2.0 s after the rifle was fired. The echo from the other wall is heard 2.0 s after the first echo. How wide is the valley?

Homework Equations



I dont know any relevant equations. v=wavelength x frequency? Do I have to convert something into decibels?

The Attempt at a Solution



time=2 s
distance=?
.
 
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Answers and Replies

  • #2
960
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No nothing that cpplex--just that the speed of sound is 340meters/sec. Hint: to avoid simple errors, draw a picture of the reflecting sound waves so as to include all the distances.
 
  • #3
tdk
13
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But I dont understand how you apply the speed of sound to the problem. Do you multiply it by 2?.
 
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  • #4
960
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know leave the speed alone and as i suggested draw a diagram. In this case, try to isolate the time requires for sound to span the valley. Hint its 1/2 the sum...
 
  • #5
tdk
13
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alright pugfug, I told you I unclicked the "Automatically parse links in text" and thats why the link wasnt clickable anymore. And now everytime I post I unclick it so it doesnt come up as a link. Do you understand that? I dont get why I cant post here if the link isnt even clickable, whats the harm?

Thanks Denverdoc I'll try that.
 
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