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λ - długość fali, T- okres fali
λ = U*T
λ=340m/s * 0.01s = 3.4m
2.
λ = U*T
T = 1/f
λ = U*1/f
λ = U/f
λ/U = 1/f
U/λ = f
(340m/s) / 2m = 170 Hz