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Hertz facts for kids

Kids Encyclopedia Facts
Wave frequency
A sine wave with varying frequency

The hertz (symbol: Hz) is a unit derived from time which measures frequency. Frequency is how often something happens. A frequency of 1 hertz means that something happens once a second. The note Middle C (the C in the middle of the piano) is 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 between 20-20 000 Hz. Owls are able to hear sounds between 200-12000 Hz.

The basic units is 1/seconds

The unit is named after Heinrich Rudolf Hertz.

Bigger 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


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