Unit 20: Sound

________ is a reflected sound.

• Vibration

• Echo

• Pitch

• Volume

Sound waves travel the FASTEST through _____________.

• gases
• liquids
• solids

Amplitude is used to measure the ______ of sounds.

• echo

• pitch

• loudness

• reflection

__________ is how high or how low a sound is. 

• Echo
• Amplitude

• Pitch
• Vibration

Sound waves travel the SLOWEST through _____________.

• gases
• solids
• liquids

Sound does not travel in space because

• Distance is too far away.

• There is no matter in space.

• It is too dark.

• Space has planets.

What is frequency?

• the number of soundwaves per second

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

Why do we see lightning before we hear the thunder?

• Lightning is an illusion.

• Light travels faster than sound

• Sound travels faster than light.

Sound travels through the air as waves.

• True
• False

If you want to change the pitch of a sound, you have to change the ___

• frequency
• amplitude
• speed
• volume