Jestliže je při vyšetření zjištěno, že ucho pacienta má při frekvenci 1 kHz práh slyšitelnosti 30 dB, které z následujících tvrzení je správnou interpretací tohoto vyšetření?
Ve které z následujících situací vede Dopplerův jev ke zvýšení frekvence přijímaného ultrazvukového vlnění oproti frekvenci, jež danému vlnění uděluje zdroj?
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