A doorbell converts electrical energy into sound.
When the sound waves hit the eardrum in the middle ear, the eardrum starts to vibrate.
A doorbell's ring makes the eardrum vibrate. .
When a doorbell rings, what part of the body vibrates?

1) organ
2) legs
3) nerves
4) arm
5) cells
6) eye
7) eardrum
8) Limbs