We stated above that the integer n in our equations was equal to the number of quarter wavelengths that fit within a given resonating length, L. It also represents something fundamental about the frequencies of the sounds that will resonate within an air column of a given length L. 21. 'What do the two values for n in #16 and #18 tell you about the two frequencies? You can find out by considering the fact that for a constant velocity, AB f B = Am fm