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In particle physics, wave mechanics and optics, momentum transfer is the amount of momentum that one particle gives to another particle. In the simplest example of scattering of two colliding particles with initial momenta , resulting in final momenta , the momentum transfer is given by : where the last identity expresses momentum conservation. Momentum transfer is an important quantity because is a better measure for the typical distance resolution of the reaction than the momenta themselves. ==Wave mechanics and optics== A wave has a momentum and is a vectorial quantity. The difference of the momentum of the scattered wave to the incident wave is called ''momentum transfer''. The wave number k is the absolute of the wave vector and is related to the wavelength . Often, momentum transfer is given in wavenumber units in reciprocal length 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「momentum transfer」の詳細全文を読む スポンサード リンク
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