A unit of frequency in the International System of Units (SI), Hertz (Hz) quantifies how many cycles or oscillations of a periodic waveform occur in one second. The unit is named after Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
Common Uses
Hertz is used to express the frequency of various phenomena:
- Electrical Signals: In electronics and telecommunications, Hertz specifies the frequency of signals, such as radio waves, audio signals, and clock frequencies in digital circuits.
- Sound: In audio, Hertz represents the frequency of sound waves, with lower values corresponding to lower-pitched sounds and higher values indicating higher-pitched sounds.
- Waveforms: In physics and engineering, Hertz describes the frequency of oscillatory or wave-like phenomena, including electromagnetic waves, mechanical vibrations, and more.
- CPU Clock Speed: In computing, Hertz measures the clock speed of central processing units (CPUs) and other components, indicating how many cycles per second the processor can execute.
Multiples
For high frequencies, Hertz is commonly expressed in multiples:
- Kilohertz (kHz): 1,000 cycles per second
- Megahertz (MHz): 1,000,000 cycles per second
- Gigahertz (GHz): 1,000,000,000 cycles per second
- Terahertz (THz): 1,000,000,000,000 cycles per second
Examples
- 1 Hertz (1 Hz): One cycle or oscillation per second
- 10 Hertz (10 Hz): Ten cycles in one second
- 1,000 Hertz (1 kHz): One thousand cycles per second
- 1,000,000 Hertz (1 MHz): One million cycles per second
- 1,000,000,000 Hertz (1 GHz): One billion cycles per second
