Sound wave

principle

Pressure oscillations in a medium.

Where it is used

Phonograph — is used in. It records sound vibrations as a groove.
Microphone — is used in. It picks up sound waves.
Loudspeaker — is used in. It creates sound waves.
Horn — is used in. It concentrates sound.
Stethoscope — is used in. It transmits sound.
Silencer — is used in. It damps sound waves.
Lithotripsy — is used in. A shock wave.
Whistle — is used in. The sound of a flow.
Wave theory — is used in. Sound is a wave.
Echo sounder — is used in. A sound pulse.
Flute — is used in. Sound.
Drum — is used in. Sound.
Headphones — is used in. The diaphragm creates a sound wave.
Alarm clock — is used in. An alarm clock wakes you with sound: the bell shakes the air.