## Hertz

Hertz is the SI (International System of Units) of unit frequency. It is the derived unit that express in Hz. Hertz is defined as cycles per one second. It is commonly expressed in multiples: kilohertz (10^{3} Hz, kHz), megahertz (10^{6} Hz, MHz), gigahertz (10^{9} Hz, GHz), terahertz (10^{12} Hz, THz), petahertz (10^{15} Hz, PHz).

This unit are sometimes also used for energy, like the photon energy equation (*E*=*h*ν), with one hertz equivalent to *h* joules.

## How we convert kilohertz to Hertz (kHz to Hz)

1kHz = 1000Hz

or

1Hz = 0.001kHz

### Kilohertz to hertz formula

The frequency in hertz (Hz) is equal to the frequency in kilohertz (kHz) times 1000:

*f*_{(Hz)} = *f*_{(kHz)} × 1000

### Example

Convert 4 kilohertz to hertz:

*f*_{(Hz)} = 4kHz × 1000 = 4000Hz

### Kilohertz to Hz conversion table

Kilohertz (kHz) | Hertz (Hz) |

0 kHz | 0 Hz |

0.001 kHz | 1 Hz |

0.01 kHz | 10 Hz |

0.1 kHz | 100 Hz |

1 kHz | 1000 Hz |

10 kHz | 10000 Hz |

100 kHz | 100000 Hz |

1000 kHz | 1000000 Hz |

Frequency of radio waves

**Radio waves** are a type of electromagnetic wave with wavelengths longer than infrared rays. It has frequencies as high as 300×10^{9} hertz (GHz) to as low as 30 hertz (Hz). At 300 GHz, the corresponding wavelength is 1 millimeter, and at 30 Hz is 10,000 kilometer. Like other electromagnetic waves, it also travels at the speed of light in vacuum. They are generated through electric charges undergoing acceleration, such as time varying currents. Radio waves that naturally occur are emitted by lightning and astronomical objects.

### Speed, wavelength, and frequency of radio waves

In a vacuum the Radio waves travel at the speed of light. When it passes through a material, its speed reduces according to that permeability and permittivity of an object. Air has low density so that in the atmosphere radio waves travel very close to the speed of light.

The wavelength is the distance from one peak of the electric wave (wave’s peak/crest) to the next, and it is inversely proportional to the frequency. In a vacuum a radio wave travels the distance in one second is 299,792,458m which is the wavelength of a 1 hertz radio signal.