the number of crests or troughs of a wave that pass by over a certain amount of time

• frequency

• wavelength

• period

• time

the matter through which a wave travels (solid, liquid, gas)

• matter

• material

• stuff

• medium

the measure of how high or low a sound is measured in hertz

• frequency

• wavelength

• amplitude

• pitch

a form of energy that is produced by vibrations and can be heard

• sound

• vibration

• noise

• echo

to move back and forth quickly

• rotate

• vibrate

• swing

• shift

the loudness of a sound measured in decibels

• volume

• amplitude

• wavelength

• pitch

a unit used to measure the intensity of a sound

• decibel

• hertz

• megahertz

• meters per second

reflected sound

• echo

• amplitude

• refraction of sound

• dispersion

using sound waves to find out what is around you. this is often used by animals such as bats, dolphins and whales

• echo

• echolocation

• constructive interference

• destructive interference

when waves interact with each other

• interference

• echolocation

• constructive interference

• destructive interference