Frequency

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A volume may be the quantity of oscillations in a present in alternating current each minute, often expressed in hertz. Or even the term frequency could also reference the quantity of rounds an audio wave goes down and up.

If a current completes one cycle per second, then the frequency is 1 Hz; 60 cycles per second equals 60 Hz (the standard alternating-current utility frequency in some countries).

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Martin Cooper (inventor) Inventing handheld cellular mobile phone Making world’s first handheld cellular mobile phone call. Martin “Marty” Cooper (born December 26, 1928) is an American engineer.