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NOISESoundSoundSoundSoundPropagationofsoundPropagationofsoundPerceptionofsoundOtherspecieshaveadifferentrangeofhearing.Forexample,dogscanperceivevibrationshigherthan20kHz,butaredeaftoanythingbelow40Hz.Asasignalperceivedbyoneofthemajorsenses,soundisusedbymanyspeciesfordetectingdanger,navigation,predation,andcommunication.Earth'satmosphere,water,andvirtuallyanyphysicalphenomenon,suchasfire,rain,wind,surf,orearthquake,produces(andischaracterizedby)itsuniquesounds.Manyspecies,suchasfrogs,birds,marineandterrestrialmammals,havealsodevelopedspecialorganstoproducesound.Insomespecies,theseproducesongandspeech.Furthermore,humanshavedevelopedcultureandtechnology(suchasmusic,telephoneandradio)thatallowsthemtogenerate,record,transmit,andbroadcastsound.Thescientificstudyofhumansoundperceptionisknownaspsychoacoustics.PhysicalofsoundAcousticsistheinterdisciplinarysciencethatdealswiththestudyofallmechanicalwavesingases,liquids,andsolidsincludingvibration,sound,ultrasoundandinfrasound.Theapplicationofacousticscanbeseeninalmostallaspectsofmodernsocietywiththemostobviousbeingtheaudioandnoisecontrolindustries.NoiseNoiseNoiseNoiseControl
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