Which feature of sound tell us about about pitch of the sound?

How does frequency affect pitch?

It refers to the number of waves crests that pass a point during one second; measured in Hertz (Hz)

Erin and John are communicating with each other using a string telephone that they have made. What vibrates when John speaks?

What vibrates after vibration of the ear drum in human ear?

__________________ detects the sound from all around.

___________ has tiny hairs to transform vibrations into electrical signals.