Hertz

Other ways to say hertzinverse secondcycles per second

The hertz (symbol: Hz) is a unit derived from time which measures frequency in the International System of Units (SI). Frequency is how often something happens. A frequency of 1 hertz means that something happens once a second. While "hertz" and "Hz" are the standard ways to express it, other expressions are sometimes used, as shown in the table.

The note Middle C (the C in the middle of the piano) is 261.65 (262) Hz. This means there are 262 vibrations every second, which is heard as the note Middle C, when that piano key is played.

Humans are able to hear sounds from (20 to 20 000) Hz. Owls are able to hear sounds between 200 and 12 000 Hz.

The basic unit is per second. The unit is named after the German physicist Heinrich Rudolf Hertz.

 Multiple units 
1000 hertz is 1 kilohertz. 1000 kilohertz is 1 megahertz, 1000 megahertz is 1 gigahertz: (see table)
 Unit Equal to: Kilohertz (kHz) 1000 Hz Megahertz (MHz) 1000 kHz Gigahertz (GHz) 1000 MHz Terahertz (THz) 1000 GHz Petahertz (PHz) 1000 THz Exahertz (EHz) 1000 PHz Zettahertz (ZHz) 1000 EHz Yottahertz (YHz) 1000 ZHz Ronnahertz (RHz) 1000 YHz Quettahertz (QHz) 1000 RHz

 Examples 
 The frequency of the Earth's spinning (once per ~24 hours) is about 12 microhertz (much smaller than 1 Hz).
 The hertz is sometimes used to measure the power of a processor in computing and electronics.
 Amateur radio in the United States of America is at different frequencies between 1.8 and 1300 MHz
 Air traffic control uses frequencies between 3 and 25 MHz as well as frequencies between 108 and 136 MHz
 Musical note middle G (G4) has a frequency of 392 Hz.

 Sources 

Category:Units of frequency
Category:SI derived units