Atenție maximă.
ν < 16 Hz
16 Hz ≤ ν ≤ 20 kHz
ν > 20 kHz
ν < 16 Hz
16 Hz ≤ ν ≤ 20 kHz
ν > 20 kHz
ν < 16 Hz
16 Hz ≤ ν ≤ 20 kHz
ν > 20 kHz
Adevărat
Fals
Adevărat
Fals
Adevărat
Fals
prin vid;
Numai într-un mediu elastic.
Are frecvența mai mică;
Are frecvența mai mare.
Adevărat
Fals
Adevărat
Fals
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