plot3d | f = 1/(ln(2) * c * (r1 + 2*r2)) | r1 = 220 to 10220, r2 = 220 to 10220, c = 1*10^-6

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.