Question 14.AP.6: WHY DOES THE PROFESSOR SOUND LIKE DONALD DUCK? A professor p...

College Physics

WHY DOES THE PROFESSOR SOUND LIKE DONALD DUCK?

A professor performs a demonstration in which he breathes helium and then speaks with a comical voice. One student explains, “The velocity of sound in helium is higher than in air, so the fundamental frequency of the standing waves in the mouth is increased.” Another student says, “No, the fundamental frequency is determined by the vocal folds and cannot be changed. Only the quality of the voice has changed.” Which student is correct?

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