It refers to the loudness of the sound.

How high or how low a sound is a _______.

The bouncing of a sound wave off a surface is ________.

To increase the volume of a sound you must ____________.

Why does blowing into a trumpet make a sound?

High pitch sounds are caused by a ______ vibration.

Sound is a form of _________.

When something ________________, it moves back and forth very fast.

If you walk into an empty room and yell, why would you hear an echo?

Light, heat and sound are forms of energy.

When the sound waves reach your ears, the air in your ears does not vibrate.

When you speak, the vocal cords in your throat vibrate.

Soft sounds have more energy and so they can travel far.

The sonar is used to to locate large objects under the sea and to determine the depth of it.