Deep-sea divers often breathe a mixture of helium and oxygen toavoid the complications of breathing high-pressure nitrogen. Atgreat depths the mix is almost entirely helium, which has the sideeffect of making the divers' voices sound very odd. Breathinghelium doesn't affect the frequency at which the vocal cordsvibrate, but it does affect the frequencies of the formants. Thetext gives the frequencies of the first two formants for an \"ee\"vowel sound as 270 and 2300 Hz.
What will these frequencies be for a helium-oxygen mixture inwhich the speed of sound at body temperature is 720m/s ? (Use 350m/s for the speed of sound in the air.)
