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Dit: v?
Jwb:
gunakan rumus yg didapat dr percobangan tabung resonansi;
L1 = 1/4 . λ
λ = 4 . L1
λ = 4 . 0,9
λ = 3,6 m
v = λ . f
v = 3,6 . 95
v = 342 m/s