The production of sound depends on the behavior of the larynx and the vocal tract. When speaking, the lungs produce air, push it up, and it exits via the larynx meeting the vocal cords. The mucous membranes stretch horizontally hit the larynx which in turn vibrates. The vibration stimulates the air molecules in the vocal tract to set up resonance frequencies. The pitch depends on the magnitude of vibration of the vocal cords which alters the frequency of the sound. This phenomenon can be represented in the form of linear modeling referred to as the source-filter theory.
vibration of the air in the vocal cords determines the nature of the sound
produced. The sound heard by another person when one speaks depends on the
composition of air in the surrounding. As such, the typical sound produced is
due to the air inhaled. Nitrogen is seven times denser than helium. Air is
composed of 78.08% of nitrogen. Since helium is lighter than air, sound travels
faster through helium. While sound travels at a speed of 344m/s in the air, it
travels at 927m/s through helium.
Inhaling helium changes the composition of gas molecules in the vocal tract. As a result, the effect increases the speed of sound thereby changing the voice. More so, the speed of sound increases its frequency, and this causes the resonance of vocal cords to change its sensitivity to a higher frequency of sound. As such, the difference in sound produced while inhaling oxygen and that produced when inhaling helium is the pitch. Normal air contains oxygen which produces normal sound but when helium fills the air, the voice produced has a squeaking effect due to increased frequency.
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