Answer the following question given this paragraph: 

6. Sound energy is a form of mechanical energy that starts with a vibration in matter. For example, the singer’s voice starts with vibrations of his vocal cords, which are folds of tissue in his throat. The vibrations pass to surrounding particles of matter and then from one particle to another in waves. Sound waves can travel through air, water, and other substances, but not through empty space.


Q: What is a form of mechanical energy that starts with a vibration in matter?

 Choices:

- solar energy

- electrical energy

- industrial energy

- sound energy

A:
sound energy
