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

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

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

to move back and forth quickly

the loudness of a sound measured in decibels

a unit used to measure the intensity of a sound

reflected sound

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

when waves interact with each other

when two waves cancel each other out

when two waves amplify each other

multiple reflection of the sound (echos) within a closed space