Jawabanmu

2014-04-20T21:43:52+07:00
Jadi lamda = 2,5 . 400 = 1000 dan frekuensi = n/t """ 900/2,5= 360
2014-04-21T01:53:26+07:00
T=2,5s
v=400m/s
n=900

f=n/t
  =900/2.5
  =360Hz

λ=v/f
  =900/360
   =2.5m