Jakým hodnotám hladiny intenzity zvuku v dB přibližně odpovídá rozmezí prahu slyšitelnosti a prahu bolesti?
Správná odpověď je: D
Intenzita zvuku I0 označuje intenzitu zvuku na prahu slyšitelnosti a je stanovena na 10−12 W · m−2. Ze vzorce pro hladinu intenzity zvuku L = 10 · log (I/I0) vyplývá, že intenzita zvuku I = I0 odpovídá hladině intenzity zvuku 0 dB, protože dekadický logaritmus 1 je roven 0. Zvuku o I = I120 odpovídá hladina intenzity zvuku 120 dB, protože:
L130 = 10 · log (1/10−12) = 10 · log (100 · 1012) = 120 dB.
Různé učebnice uvádějí rozdílné hodnoty prahu bolesti, což je mimo jiné dáno různou citlivostí uší mezi jedinci, obvykle je však práh bolesti v rozmezí 120–140 dB.
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