Sound Energy

In which medium will sound travel the fastest?

• air
• water
• glass
• salt water

What is vibrate?

• moving foward
• moving backwards
• moving back and forth very slow
• moving back and forth very fast

What is frequency?

• the number of vibrations per second
• how high or low a sound is
• the loudness or softness of a sound
• the back and forth movement of matter

Measure of how high or low a sound is

• amplitude
• compression
• speed of sound
• pitch

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

• The gym walls are soft and uneven. 
• The sound waves are being absorbed by the hard smooth walls.
• The sound waves are bouncing off the hard smooth gym walls.
• The gym walls are really clean.

Why do we not hear sound in outer space?

• there is no one out there to hear it.
• it is so cold
• it is a vacuum or empty space so there is not a medium for sound to travel
• there are too many stars that are exploding

The ___________________ is how loud or soft a sound is. 

• echo
• frequency
• pitch
• volume

Which word describes how LOUD a sound is?

• volume
• pitch
• frequency
• tone

Objects that vibrate more quickly create 

• low pitches
• high pitches

The higher the amplitude of a sound wave, the ____ the sound. 

• louder
• quieter