Hertz (unit)
The hertz is the SI unit of frequency, and has units of inverse seconds. The hertz is uned only for periodic phenomena.[1] The symbol of the hertz in SI is Hz.
The hertz is named for Heinrich Hertz (1857 - 1894), an early pioneer in electromagnetic research and the first person to demonstrate the transmission of electromagnetic waves.
The hertz is a derived unit in the SI, equal to 1 s-1. (Hz = s-1)
Practical use
Household alternating electrical current is usually 50 Hz or 60 Hz. In the United States, commercial AM radio boradcasting uses frequencies between 535 kHz and 1605 kHz (1.605 MHz), and commercial FM radio broadcasting uses frequencies from 87.5 MHz to 107.7 MHz. Visible light has a frequency of about 400 THz to 750 THz.
Automobile engines typically idle between 10 and 20 Hz. The earth rotates with a frequency of approximately 11.57 µHz (11.57 microhertz)
Notes
- ↑ The International System of Units (SI). BIPM (2006)., p. 118