Sound - grade 3

What medium does sound travel through slowest?

• gas

• solid

• liquid

• trees

Sound is caused by....

• Molecules

• people

• vibrations

Sound does not travel in space because

• Space is too far away

• There is no matter in space.

• Space has planets.

What is vibration?

• how loud a sound is

• the back and forth movement of matter

• the loudness or softness of a sound

What is frequency?

• the number of vibrations per second

• how high or low a sound is

• the loudness or softness of a sound

Measure of how high or low a sound is

• amplitude

• compression

• pitch

A longer string makes a _______ pitch than a short string.

• louder

• softer

• lower

An object that does not vibrate cannot produce

• sound

• light

• heat

Sound is a form of?

• pitch

• energy

• volume

Your ear changes the vibration of sound waves into signals. The signals are then interpreted by your brain.

• True

• False