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T : 15s
Dit : v....?
Jawab : f = panjang gelombang ÷ T
f = 5,4 m ÷ 15s
f = 81 Hz
v = panjang gelombang × f
v = 5,4 m × 81Hz
v = 437, 4 m/s
jadi, cepat rambat gelombang dalam air adalah 437,4 m/s