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19. Multiple choice question XIX

1. Infrasonic vibrations have frequency:

less than \(10\ Hz\)
less than \(20\ Hz\)
between \(20\) and \(20,000\ Hz\)
more than \(20,000\ Hz\)

2. The range of sonic waves is between:

\(20\ Hz\) to \(2000\ Hz\)
\(20\ Hz\) to \(10,000\ Hz\)
\(20\ Hz\) to \(15,000\ Hz\)
\(20\ Hz\) to \(20,000\ Hz\)

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