The World of Sound

able alter animals ball becomes begins blows body called carries cause cavity centre changes close comes consider course depends direction drop easily easy edge effect electrical equal example experiment fact fall feet figure finger fish flame follow front give given goes hand happens hear heard holes illustration important inches interesting kind leaves length less light lines listening lower means metal miles mirror motion mounted move movement musical natural noise observer once pass pendulum piece pipe pitch plate play position pressure pulses quivers reaches record reflected rest ripples round runs seen sensitive shown shows side simple Sometimes sound spread string succession surface swing tank thing touch travels tube turn vibrating wall waves wheels whistle wind wire