2 = √ atau = = . ( ) , = = = ( ) , = . = × = / = 150 cm = 1,5 m = 7,2 g/m = 7,2 × 10 −3 kg/m Maka besarnya tegangan dawai: = 1,5 gelombang 2 = 50 Hz = −3 2 = 50 × (7,2 × 10 ) −3 = 2500 × (7,2 × 10 ) = 18 N