In SI system, unit of wavelength is meter. Any way meter is a large unit so we use Angstrom and some times nanometer. Angstrom (Ǻ) equals to 10 -10 m and nano metre equals to 10-9 m. The range of wavelength for visible light is from 3700 Ǻ to 7200 Ǻ.
For visible light, the wavelength will usually be specified in nm (nanometers).
metre
The wavelength of a wave is the distance from the crest to the next crest of a wave, usually measured in metres. A wavelength is not a unit.
Nanometres. mX10^-9
The unit of measuring wavelength of light is typically in nanometers (nm). One nanometer is equal to one billionth of a meter, making it a convenient unit for measuring the very small wavelengths of light.
The unit of wavelength is a Hertz, written as Hz.
Wavelength is a length. The SI unit for length is the meter (m).
Wave speed = (frequency) x (wavelength) = (238 x 9) =2,142 (same length unit as the wavelength) per second.
Above a wave's wavelength is its frequency, which represents the number of wave cycles that pass a fixed point in a unit of time. Frequency and wavelength are inversely proportional in that as wavelength decreases, frequency increases, and vice versa.
Wavelength is a length. As such, any unit of length is suitable as a description of wavelength. The SI unit of length is the meter. Along with its multiples and sub-multiples, the meter is a dandy unit of wavelength.
"Wavelength" is described in any convenient unit of length or distance, such as meter, foot, inch, furlong, kilometer, Angstrom, smoot, light-year, etc.
Wavelength is a length. Hence, the metric unit for it is "meter". Frequency is a reciprocal of time. Hence, the unit for it is "per second", named "Hertz".