Sound Waves: Crash Course Physics #18

What does sound need to be transmitted?

• matter

• a story

• length

• vacuum

Sound can not travel through space because

What is an example of a medium? Click all that apply.

• Water

• Air

• Outer Space

Sound waves travel in which directions?

• up and down

• in a circle

• left to right

• back and forth

What does sound waves do to the atoms and molecules in the air?

• move around in circles

• make the atoms and molecules move back and forth

• switch places

• stop moving

What does the air do that is moved by the sound wave? Click all that apply.

• bunching together in some places

• slow down

• go faster

• spreading out in some places

When the air particles compress or bunch together it is a

• rarefaction and it has lower pressure

• compression and it has higher pressure

Sound waves are sometimes called pressure waves.

• True

• False

What are some of the qualities of sound?

• vibrations and sounds

• loudness and pitch

• small or big

• short and long

Air that is vibrating more times per second will have a ________ pitch and air that is vibrating fewer times per second will have a _______ pitch.

• compression, rarefaction

• faster, slower

• higher, lower

• bigger, smaller