Sound

First the funnel in the ear canal and causes the eardrum to move. Then the eardrum vibrates with sound. Sound vibrations move through the ossicles to the cochlea. Then the sound wave goes to the brain and we can listen to sounds.

The speed of the sound at the sea level is 340.29m/s

Doppler effect is happened when you go towards something, like when you are towards something, you sound high pitch and when you are far away from something the sound sounds low.