To and fro

guitar 1972 or so_adj02-sm.jpg

SCIENCE NOTEBOOK, 1970

1. When there is a sound, something is moving.

2. As you sing, something in your throat vibrates.

3. A police mans whistle makes a high sound. We say it is high pitch.

4. As the pitch of a sound goes lower, the vibrations go slower.

5. When a thing vibrates, it moves to and fro.