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3 puncak 2 lembah = 2,5λ
s= 2,5λ
Ditanya frekuensi f dan periode T.?
v = s/t
v = λ.f
s/t = λ.f
2,5λ/t = λ.f
2,5λ/2 = λ.f
f = 2,5 / 2
f = 1,25Hz
T = 1/f
T = 1/1,25
T = 0,8s