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V = 320 m/s
diatnya = f...?
karena resonansi 1 jd..
L = 1/4 panjang gelombqnh
20 = 1/4 panjang gelombang
panjang gelombang = 20 × 4 = 80 cm -> 0,8 m
v = f × p
320 = f × 0,8
400 hz = f