A normal human ear is able to hear sounds with frequencies from 20 Hz to 20,000 Hz . The range of 20 Hz to 20,000 Hz is called the audible frequency range. The sounds we hear comprise of various frequencies.
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High frequency (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). … High frequency. Frequency range3 to 30 MHzWavelength range100 to 10 mHigh frequency – Wikipedia en.wikipedia.org › wiki › High_frequency
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