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Verified answer
Persamaan gelombang berjalan6 puncak 5 lembah = 5 ½ λ
5 ½ λ = 2 m
λ = 2 ÷ 5,5
λ ≈ 0,4 m
f = v / λ
f = 20 / 0,4
f = 50 Hz
Jadi , panjang gelombang 0,4 m ; frekuensi 50 Hz.
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