Q. how do bells ring?
A. Bells make sounds because the metal they are made of vibrates when they are struck. Bells are usually made of bronze, a mixture of copper and tin. And they are made so that the lips of the bells can vibrate freely. It is important for good vibrations for the bell to be suspended from its top. The width of the base of the bell should be in proportion to its height and thickness, As the sound waves move toward the top of the bell, they create sounds known as overtones. That's why the sound lasts so long.