9.7 Sound Waves and Air Particles HS-PS4-1

What is the primary medium through which sound waves are produced?

• Light waves

• Vibration of molecules

• Magnetic fields

• Electrical currents

What happens to air particles when the elastic skin of a drum is hit?

• They disappear

• They compress

• They expand indefinitely

• They change color

What is the term for the region where air particles are closer together after being compressed?

• Expansion

• Rarefaction

• Compression

• Diffusion

What occurs when the elastic skin of the drum moves back to its original position?

• Air particles compress further

• Air particles spread apart

• Air particles remain stationary

• Air particles change temperature

What is the term for the region where air particles are spread apart?

• Compression

• Rarefaction

• Contraction

• Condensation

Sound waves are __________ waves in which the motion of the particles in the medium is parallel to the direction where the wave travels.

• transverse

• longitudinal

• surface

• electromagnetic

Sound waves require a medium such as solids, liquids, or gases to propagate. Without a medium, there will be no particles that will vibrate, thus, no production of sound. What is this medium called?

• Vacuum

• Conductor

• Medium

• Insulator

The __________ of sound is the distance that sound travels in a given amount of time.

• frequency

• amplitude

• speed

• wavelength

Sound travels faster and better in __________ than in air.

• solids

• gases

• liquids

• vacuums

What property of an object allows it to change shape when a force is applied and return to its original shape once the force is removed?

• Density

• Elasticity

• Mass

• Volume