Waves 5

How much higher could I sing if I breathed in Helium?

A singer would like to make his voice higher by breathing in Helium. The human voice works in the same way as a wind instrument. Vibrations in the air cause standing waves to be set up in the mouth and nose which act like a closed pipe. If the singers high note is 250 Hz in air what will it be when Helium is breathed in?

Speed of sound in air = 340 ms-1

Speed of sound in helium = 1000 ms-1