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hertz
(redirected from kilohertz)

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hertz

SI unit of frequency (the number of repetitions of a regular occurrence in one second). A wave source has a frequency of 1 Hz if it produces one wave each second. Human beings have an audible range from approximately 20 Hz to 20,000 Hz. Radio waves are often measured in megahertz (MHz), millions of hertz, and the clock rate of a computer is usually measured in megahertz. The unit is named after German physicist Heinrich Hertz.
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But following demand for a device that would get rid of all undesirables regardless of age, the new Mark 4 version can operate at a lower eight kilohertz frequency that adults can hear too, annoying everyone within earshot.
Mosquito teen-repellent device can now irritate grown-ups too by AFP / AFP Global Edition
The Mosquito emits a whining sound at 18 kilohertz that switches on and off four times a second for up to 20 minutes.
Uproar over noise 'gun' CRIME: MP demands health inquiry on Mosquito by Birmingham Mail (England)
Using equipment designed to study the very high-pitched bleeps that bats make, scientists have found that the frog calls also include very high-pitched chirps that topped 20 kilohertz (20,000 cycles per second)--sound frequencies that people can't hear.
Ultrasonic frogs raise the pitch by Sohn, Emily / Science News for Kids
 
 
 
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