Relation between cavity resonance and sound speed

AI Thread Summary
Inhaling helium raises the sound speed, resulting in a higher pitch, akin to a "Donald Duck" voice, due to changes in cavity resonance. The wavelength of sound is determined by the size of the vocal cavity, while frequency is influenced by both the speed of sound in the gas and the properties of the vocal folds. Some argue that frequency is solely dependent on the vocal folds, suggesting that the gas only affects timbre. The discussion highlights the complexity of how sound frequency and cavity resonance interact, particularly when gas composition changes. Understanding these relationships is crucial for grasping the physics of sound production.
haleycomet2
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Our sound will be like "Donald Duck" if we inhale helium gas and the explanation from web is because" The cavity resonances which determine the vocal formats would be raised by the higher sound speed,"(http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html). Why cavity resonance raise as sound speed raise?
 
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hi haleycomet2! :smile:

wavelength depends only on cavity size

frequency depends on … ? :wink:​
 
tiny-tim said:
hi haleycomet2! :smile:

wavelength depends only on cavity size

frequency depends on … ? :wink:​

If wavelength depend only on cavity size,then the frequency of sound is higher as the speed of gas becomes higher(cavity size stay constant when we make comparison of two gases ).

However, some says that the frequency is only depend on vocal folds and it is independent of the gas.And the only change is the timbre.

Both explanation looked convincing but i don't know which is true.:confused:

Besides,why the cavity resonance is raised when sound speed get higher(cavity size remains same)?
 

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