separation and frequency
separation and frequency are directly proportional
crest to crest or trough to trough; in-phase
crest to trough or through to crest; out-phase
an integer or 0
diffraction angle (of a speaker)
sin⊕ = 1.22(wavelength/diameter)
velocity/frequency in Hz
frequency of a string fixed at both ends
wavelength open at one end
distance between node and antinode
frequency tube open at both ends
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