Formant frequencies?

Question

The formant frequencies of speech are also influenced by the density of the propagating medium. The human vocal tract is approximately 17.3 cm long.

What is the first and second formants of this voice? The velocity of sound in air is vair=331ms. (Hint: How can you use the length of the vocal tract to find the frequency? )

How do you figure this out?

Answer 1

Please see references below