Open-Open Tube

Displacement waves in a tube open at both ends:

Figure 2: Standing displacement waves in an open tube.

Though opposite-phase to displacement on a string, the harmonics follow the same relationship:

• wavelength is $${\lambda_n = \frac{2}{n}L}$$.

• frequency is $${f_n = n\frac{v}{2L}} = nf_1$$.

Pressure waves are opposite phase to displacement waves (they look like displacement on a guitar string).