Inhaling helium increases the pitch of your voice. The reason for this is that sound travels
A) slower in helium than in air.
B) faster in helium than in air.
C) the same speed in helium, but the wavelength is greater.

Question

Quizplus · Accepted Answer

Sound travels faster in helium than in air, which causes the frequencies of the sound waves produced by your vocal cords to increase, leading to a higher-pitched voice.

Inhaling Helium Increases the Pitch of Your Voice