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20=hx20/5
20=hx4
h=5m
f : ???
dita : (lamda)
jwb = [lamda] = v : f
(kita mencari frekuensi nya dulu )
f = n : t = 20 : 5 = 4
(dimasukkan ke rumus )
[lamda] = v : f = 20 : 4 = 5 m
^mohon maaf jika salah^