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The Epic Interactive Encyclopedia 1997
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1992-09-03
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439b
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12 lines
In physics, the number of periodic
oscillations, vibrations, or waves occurring
per unit of time. The unit of frequency is
the hertz (Hz), one hertz being equivalent to
one cycle per second. Human beings can hear
sounds from objects vibrating in the range
20-15,000 Hz. Ultrasonic frequencies well
above 15,000 Hz can be detected by mammals
such as bats. One kilohertz (kHz) equals
1,000 hertz; one megahertz (MHz) equals
1,000,000 hertz.