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T=λ/v
T=1.5m:3m/s
T=0,5s
f=1/T , częstotliwość
f=1:0,5s
f=2Hz
3.
λ=v/f
λ=4m/s:3Hz
λ≈1,3m
T=1/f
T=1:3Hz
T=⅓s