| 1. | The audible range of sound is 20 hertz 20 kilohertz.
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| 2. | Ultrasound frequencies lie above the audible range, and like X-rays they penetrate solids.
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| 3. | The result is an even, linear output, accurate even at extreme frequencies beyond any audible range.
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| 4. | :I would expect it to be at the high end of the audible range, based on intuition.
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| 5. | In the audible range it is usually referred to in connection with electronic amplifiers, microphones and loudspeakers.
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| 6. | As expanding shipping traffic increases the ocean's background noise, the audible range for such mating calls has decreased.
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| 7. | However, the sonar operator can hear it, because the frequency is lowered into the audible range via a heterodyne circuit.
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| 8. | The sound, below the audible range, is generated by a high-velocity stream of air being forced through an organ pipe.
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| 9. | These in turn produce a lower frequency within the audible range that is amplified and converted into sound by a loudspeaker.
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| 10. | Plasma interacts with electrical and magnetic fields in ways that can result in vibrations in many frequencies, including the audible range.
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