Formants in an [i] model
![](media/images/ex/i_tube.png)
For this exercise assume:
lb = 8.5 cm,
lc = 4 cm,
lf = 3.5 cm.
Ab = 3 cm2,
Ac = 0.3 cm2.
The relevants formulas are:    f = c/2π * sqrt(Ac / (Ab lb lc)),     fn = nc/2l,     fn = (2n-1)c/4l
It would be a good idea to write down your answers as you go.
Correct: 0 ---- Run: 0
Image after figure 6.3 in Johnson (2012) Acoustic and Auditory Phonetics. 3rd Ed. Wiley-Blackwell