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A chamber that can be filled with different gases has placed in it a source of...

A chamber that can be filled with different gases has placed in it a source of sound that in air produces a frequency of 200 Hz and a microphone to pick up the sound for frequency analysis. First the chamber is filled with helium (speed of sound 1 000 m/s at room conditions), then the helium is replaced with oxygen (speed of sound 330 m/s at room conditions), and then finally the helium is replaced with carbon dioxide (speed of sound 269 m/s at room conditions). In which gas is the highest frequency of sound found by the microphone during this experiment?

Do they all have the same frequency of sound?

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Answer #1

Frequency of sound will be same in all the cases. In the above mentioned cases, all are gaseous mediums. The speed of sound in the medium will depend only in the elastic modulus in that medium and the density of the medium. So the velocity change in sound occurs only due to these two factors. Frequency is a base property of sound and it will not change even if medium changes. Hence, frequency will be same.

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