Sound

Sound occurs when air ______ are forced together.

• cold
• molecules
• pitches
• frequency

Pitch can be changed by changing how fast the object _____________.

• vibrates
• changes
• velocity
• shifts

Low pitches are produced by objects vibrating _______________.

• quickly
• slowly

High pitches are produced by objects vibrating _______________.

• quickly
• slowly

Sound must travel through a ______ to move from one place to another.

• space
• pitch
• medium
• frequency

True or false: You can hear me scream in space.

• true
• false

Which is NOT a medium?

• solid
• pitch
• liquid
• gas

In which medium does sound travel fastest?

• solid
• liquid
• gas

In which medium does sound travel slowest?

• solid
• liquid
• gas

Sound travels at the _______ speed in different mediums.

• same
• different