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separation and frequency

separation and frequency are directly proportional

constructive interference

crest to crest or trough to trough; in-phase

destructive interference

crest to trough or through to crest; out-phase

in-phase

an integer or 0

out-phase

a decimal

diffraction angle (of a speaker)

sin⊕ = 1.22(wavelength/diameter)

λ

velocity/frequency in Hz

frequency of a string fixed at both ends

n(v/2L)

speed

√f/linear density

wavelength open at one end

4L/n

distance between node and antinode

¼λ

frequency tube open at both ends

nv/2L

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