How do you calculate wavelength with distance? I know that it's 4L for the first harmonic of a closed end column but what is it for an open ended column or a column with one end open, one end closed? Why does it work like that?

For a closed end we have odd harmonics.fo,  3fo,  5fo,  7fo, 9fo, .......      fo =  V/ wavelength.  =  V / 4LWavelength = 4L.For a open end we have natural number harmonics.fo,  2fo,  3fo,  4fo, 5fo, .......      fo =  V/ wavelength.  =  V / 2LWavelength = 2L.