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1, 5 gel = 75 cm = 9 sekon
panjang gelombang = ...?
1, 5 gel = 75 cm
1 gel = x cm
x = 75 : 1, 5 = 50 cm
Jadi, λ = 50 cm
cepat rambat
9 sekon = 75 cm
1 sekon = 75 : 9
v = 8, 3 cm/s