1. The longer a guitar string is, the _______ the pitch (vibration speed) it produces.

higher
louder
softer
lower

2. Sound travels _______ through denser material.

slower
independently
roughly
faster

3. The faster the sound wave the higher the?

volume
pitch
elevation
decibels

4. How does an object like a tuning fork transmit sound energy?

By the vibration of air molecules
By the metal molecules changing form
By the development of metal molecules
By the vibration of electricity

5. What is one way light and sound differ?

Light can travel in outer space, but sound cannot.
Sound waves are regular, but light waves are not.
Light produces energy only when reflected; sound only when generated.
Sound does not exist unless someone hears it; light exists everywhere.

6. What is one thing scientists have learned by studying the behavior of dolphins and their echo-location ability.

How underwater sound navigation is possible
How dolphins affect other kinds of animals
How dolphins depend on light to survive
How underwater sea life depends on oxygen