Jawabanmu

2014-03-29T13:43:39+07:00
V = f × λ
  = 500 Hz × 3 cm 
  = 500 Hz × 300 m 
  = 150.000 m/s 

Jadiin yg terbaik ya! 
2014-03-29T13:49:19+07:00
v = f × λ
  = 500 Hz × 3 cm 
  = 500 Hz × 0,03 m 
  = 15 m/s