It is found that sound travels faster in helium gas than in the air. The sound waves are known to attain shorter wavelengths and a higher frequency when they pass from helium to air. This makes the sound higher. The other reason for hearing a change in your voice when Hhelium passes through is that the vocal folds vibrate with a higher speed in helium than in air, as helium is lighter than air. Also, helium does not restrict the movement of the folds much, while air causes more restriction.
It is explained that breathing in helium will not change the pitch or frequency of your voice. The change in the resonance of the voice tract will make the voice passing through helium change. The resonance vibrations are more, and they affect the timbre of the voice. So it is noticed that the timbre of the voice will not be affected by helium....we can see a man who is blowing a balloon wich is filled with helium and his voice will change due to the above reason
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