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fA = 30 Hz
PA = 1/fA
PA = 3PB maka 1/30 = 3PB
PB = 1/30 : 3 = 1/30 x 1/3 = 1/90
fB = 1/PB
fB = 1/1/90 = 90Hz
periode getaran B:
⇒
maka, frekuensi getaran B: = 90 Hz