what is meaning 20HZ
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Hertz (abbreviated: Hz) is the standard unit of measurement used for measuring frequency. Since frequency is measured in cycles per second, one hertz equals one cycle per second. ... Sound waves close to 20 Hz have a low pitch and are called "bass" frequencies.
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hz means Hertz it is value used for writing sound variance
for example human hears can hear only sound from 20 hz to 20000 hertz
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