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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?



Answer :

olemakpadu
For a closed end we have odd harmonics.

fo,  3fo,  5fo,  7fo, 9fo, .......      fo =  V/ wavelength.  =  V / 4L

Wavelength = 4L.


For a open end we have natural number harmonics.

fo,  2fo,  3fo,  4fo, 5fo, .......      fo =  V/ wavelength.  =  V / 2L

Wavelength = 2L.