Information about the End Correction Factor (k)
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In acoustics, end correction is a short distance applied or added to the actual length of a
resonance pipe, in order to calculate the precise resonant frequency of the pipe. ... A
theoretical basis for computation of the end correction is the radiation acoustic impedance
of a circular piston.
Both ends flanged: k = 0.850
One end flanged, one end free: k = 0.732
Both ends free: k = 0.614
Normally, k = 0.732 is assumed
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