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s = 30 cm
n = 1 bukit 1 lembah = 1 gelombang
t = 4 sekon
v?
penyelesaian:
v = λ . f
v = s/n . n/t
v = s . t
v = 30 / 4
v = 7,5 cm/s
nomor 2
n = A - C = 0,5 getaran
t = 0,2 sekon
f?
penyelesaian:
f = n / t
f = 0,5 / 0,2
f = 2,5 Hz