Modelová Otázka ID 3283 - 
Jaká je vlnová délka ultrazvuku o frekvenci 2 MHz v krvi, jestliže rychlost zvuku v krvi je přibližně 1 600 m/s?
Správná odpověď je: A
Pro vlnovou délku λ, frekvenci f a rychlost vlnění v v daném prostředí v platí vztah:
λ = v/f = 1 600 m · s−1/2 · 106 Hz = 1 600 m · s−1/2 · 106 s−1 =
= 0,0008 m = 8 · 10−4 m = 0,8 mm.
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