Modelová Otázka ID 3274 - 
Z následujících tvrzení platí:
Správná odpověď je: D
Zvuk je název pro akustická vlnění slyšitelná lidským uchem, tedy s frekvencemi v rozsahu přibližně 16 Hz – 20 kHz. Ultrazvuk má vyšší frekvenci, a tedy kratší vlnovou délku než zvuk (slyšitelný zvuk). Ve zvířecí říši je využíván ultrazvuk i infrazvuk, ultrazvuk je využíván k orientaci v prostoru netopýry, zatímco infrazvuk je využíván například mořskými živočichy ke komunikaci. Prahu bolesti, tedy intenzitě zvuku vyvolávající bolestivé vjemy u člověka, odpovídá intenzita zvuku přibližně 1 W · m−2.
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