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V - prędkość fali
f - częstotliwość fali
λ = V/f
a) V = λ×f = 0,02[m] × 10[Hz] = 0,2[m/s]
b)
λ = V/f = 340[m/s] / 21000[hz] ≈0,01619[m] ≈ 16,2[mm]
λ = V/f = 340[m/s] / 7[Hz] ≈ 48,5714[m]