The production of sound during speech or singing is a complicated process. Let's concentrate on the mouth. A typical depth for the human mouth is about 7.80 cm , although this number can vary. (Check it against your own mouth.). We can model the mouth as an organ pipe that is open at the back of the throat.

PART A: What are the wavelengths of the first four harmonics you can produce if your mouth is open?

PART B: What are the frequencies of the first four harmonics you can produce if your mouth is open? Use 350 m/s.

PART C:What are the wavelengths of the first four harmonics you can produce if your mouth is closed?

PART D: What are the frequencies of the first four harmonics you can produce if your mouth is closed?