Which kind of wave carries sound through air?

Jomar pushes and pulls a slinky along its length. How do its coils move as the disturbance travels?

What is a tightly crowded region in this diagram called?

In a sound wave, how does a region with air particles farther apart compare with undisturbed air?

Which part vibrates to produce Liza's voice when she speaks?

Which surroundings would prevent an object from transmitting sound to a distant receiver?

Through which material does sound usually travel fastest over the same distance?

Ben pinches the stretched string of a tin-can telephone. Why does Mia's voice become fainter at his can?

Nearby students begin shouting while Paolo listens through a tin-can telephone. Why does the message become harder to understand?

A foam ball hangs against a speaker cone. What should happen to the ball when the speaker starts producing sound?

Which change would make the same rubber band produce a higher note while its vibrating length stays fixed?

These traces show sounds recorded over the same time. How would the sounds differ?

Rico plucks the same rubber band more forcefully without changing its tension. What changes most?

These traces use identical scales and show the same recording duration. Which comparison fits the sounds?

A guitar string makes more back-and-forth movements each second. Which property has increased?

What names the change in a siren's heard note caused by motion between the vehicle and listener?

An ambulance approaches a stationary listener while emitting a steady tone. Compared with when the ambulance is parked, how does the tone sound?

A stationary fire truck emits a steady tone. Carlo moves away from it. How does his heard tone compare with that of a stationary listener?

Compare the wavefronts ahead of and behind the moving source. How is their spacing different?

Which situation would produce no motion-related change in the heard note of a steady siren?