Jawabanmu

2014-04-17T13:27:23+07:00
F =n/t
  = 1 : 1/3 = 3 Hz

V = panjang 1 gelombang x f
   = 0,4 x 3 = 1,2 m/s (B)
2014-04-17T13:48:09+07:00
V = panjang 1 gelombang x f
   = 0,4 x 3 = 1,2 m/s (B)
f = n/t
= 1 : 1per 3 
= 3 Hz