Wavelength in kilometers (λ km)

Electromagnetic wavelength in vacuum, in kilometers. Frequency = 299,792.458 ÷ wavelength in km (Hz).

What is a kilometer of wavelength?

Symbol: λ km
Quantity: Frequency & Wavelength
Unit system: SI
Definition: Electromagnetic wavelength in vacuum, in kilometers. Frequency = 299,792.458 ÷ wavelength in km (Hz).
Exact: Yes, the value is exact by definition
Source: SI Brochure, 9th edition (BIPM, 2019)

Used for very low frequency and long-wave radio, where a single wave can be kilometers long.

Wavelength in kilometers in other units
Wavelength in kilometers	Megahertz	Wavelength in meters	Hertz
1 λ km	= 0.299792458 MHz	= 1000 λ m	= 299792.458 Hz
10 λ km	= 0.0299792458 MHz	= 10000 λ m	= 29979.2458 Hz
100 λ km	= 0.00299792458 MHz	= 100000 λ m	= 2997.92458 Hz
1000 λ km	= 0.000299792458 MHz	= 1000000 λ m	= 299.792458 Hz

The next smaller frequency & wavelength unit is the kilohertz (kHz). 1 λ km = 299.792458 kHz, and 1 kHz = 299.792458 λ km.

The next larger frequency & wavelength unit is the megahertz (MHz). 1 λ km = 0.299792458 MHz, and 1 MHz = 0.299792458 λ km.

How many megahertz are in one kilometer of wavelength?: One kilometer of wavelength = 0.299792458 MHz (megahertz).
How many meters of wavelength are in one kilometer of wavelength?: One kilometer of wavelength = 1000 λ m (meters of wavelength).
How many hertz are in one kilometer of wavelength?: One kilometer of wavelength = 299792.458 Hz (hertz).