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f = ¼ Hz
periode (T) = 8 s / 2 gel.
T = 4 s
amplitudo = 4 ---->(tinggi bukit ataupun lembah)
panjang gel. (lambda) = 2¼ gel. / 18 m
= (9/4) / 18
= 9 / 72
= ⅛ m
cepat rambat (V) = ⅛ . ¼
V = 1 / 32 m/s
nb :