Helium has a lower density than air, but frequency does not change when sound goes from one medium to the other.
Since sound velocity is higher in helium, it is like having your vocal cord and mouth as resonator reduced in size, making higher frequency with the same "tension" from yourself. (same as with violin and violoncello)In a popular and amusing science demonstration, a person inhales helium...?
Helium has a lower density than air. Frequencies are higher in lower density mediums. So when a person speaks after inhaling helium, their voice is high and squeaky.
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