A wave with a wavefront perpendicular to a certain direction of travel. When the wave source is very far away, the wave can be approximately considered as a plane wave. In terms of light, a plane wave corresponds to a parallel beam of light. In quantum mechanics, the state in which the position vector is r , the wave number vector is k , and the wave function is expressed as the spatial part of a sine plane wave exp ( i k・r ) is a state in which momentum is constant and plays an important role. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
一定の進行方向に垂直な波面をもつ波。波源からきわめて遠く離れているとき,波は近似的に平面波とみなすことができる。光でいえば,平面波は平行光線に対応する。量子力学では,位置ベクトルを r ,波数ベクトルを k とし,波動関数が正弦平面波の空間部分 exp (ik・r) で表わされる状態は,運動量が一定の状態であり,重要な役割を果している。
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