If you’re wondering about the name, it comes from the fact that it vibrates and makes a sort of vrr vrr sound. Need to be quiet? A small switch on the side shuts off the vibrations. The 4×4 ...

Well, sounds are made when objects - like this string - vibrate. When it vibrates it makes a sound…and when it’s not vibrating it makes no sound at all! Every time an object vibrates ...

As it vibrates it movesthe air particles around it which vibrates the ones next to themand the ones next to them. You've formed a sound wave. When that sound wave reachesyour ear you hear a note.