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Jika AC = 15 cm
Amplitudo = 15/2 = 7,5 cm
t = 0,2 s
n = 1/4 getaran
T = t / n
T = 0,2 / (1/4) = 0,2 * 4 = 0,8 Sekon
f = 1/T = 1 / 0,8 = 1,25 Hz
Nomor 9
v = 3*10⁸ m/s
λ = 90 m
f = v / λ
f = 3*10⁸ / 90 = 3,33*10⁷ Hz