Wavenumber ( $k$ )

The wavenumber is the spatial angular frequency of a monochromatic wave. A factor

e^{ik x}

2 π /∣ k ∣

.

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- Wavelength Wavenumber

Wavelength ( $λ$ )

The wavelength is the spatial period of a monochromatic wave. For angular wavenumber

k

, it is

λ = 2 π /∣ k ∣

.

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Wavenumber is a measure of the number of wavelengths per unit distance and is used in various fields such as physics, chemistry, and optics. It is defined as the reciprocal of the wavelength and is usually expressed in units of reciprocal length, such as inverse meters (m⁻¹).

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