Sound Intensity

[falcon0311]

I'm given two things:

frequency, f = 313 Hz
intensity, I = 1.13 uW/m^2 (microWatts per square meter)

I'm supposed to find the amplitude of the air vibrations caused by this sound.

As always, a push in the right direction is greatly appreciated.

[Sirus]

You need a formula; do you have any? Unfortunately the formulas for this stuff are big and complex.

[falcon0311]

1......v( delta Pm )^2
- * ------------------- = I
2...............B


I think what I'm seeking is sm, in which case

sm = (delta Pm) / (kB) [k is from (kx - wt)]


Anyone know a program or website that lets me type scientific equations? This spacing stuff gets old fast.

If I work those formulas around, I think I get:

I / k = (1/2)(v)(delta Pm)*sm

The problem there is I don't know what (delta Pm) would be.

[falcon0311]

I'm not really sure that whole equation is necessary, but I'm also not sure how to shorten it and figure it out with the two variables given.

[Sirus]

We do math typesetting on here using a code called Latex. See the sticky about it in General Physics. Sorry, I'm not very familiar with these formulas. Someone will chime in and help! ;)