Calculating the Width of a Valley Using Echo Time Delay

[tdk]

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 don't 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=?
.

 

[denverdoc]

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.

 

[tdk]

But I don't understand how you apply the speed of sound to the problem. Do you multiply it by 2?.

 

[denverdoc]

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...

 

[tdk]

alright pugfug, I told you I unclicked the "Automatically parse links in text" and that's why the link wasnt clickable anymore. And now everytime I post I unclick it so it doesn't come up as a link. Do you understand that? I don't get why I can't post here if the link isn't even clickable, what's the harm?

Thanks Denverdoc I'll try that.