Every sound producing object VIBRATE, then do computer and cell phones vibrate, when we hear song on them?

Question

what's the thing in PCs and mobile phones that vibrate during producing sound?

Answer 1

yep, it's called a speaker.

http://en.wikipedia.org/wiki/Loudspeaker

Answer 2

The diaphram of the speaker vibrates.

Answer 3

They have small loudspeakers in them. The vibrating object is a tight piece of material that is vibrated thru magnetic induction. The electric current varies as the notes change, thus inducing different vibrations and different sounds.