This is a kind of unique dual calculator that gives you the distance (wavelength) in CM (centimeters) according to the selected frequency in Hertz or vice versa. All in relation to the property of the medium (WAVE/SEC).
34300 is chosen as an average speed of sound in air. 148100 is a good suggestion in water.
It might be useful for some people to have a stand-alone app for doing just this. To see more apps like this, go to www.discobajas.com