对平面简谐波波动方程的讨论

Discussion on Plane Harmonic Waves Equation

若波源不在原点,沿x轴正方向传播的平面简谐波波动方程为y=Acos[ω(t+(l-x)/u)+φ],沿x轴负方向传播的平面简谐波波动方程为y=Acos[ω(t-(l-x)/u)+φ]。

If the wave source is not at origin,t hen the wave equation of plane harmon ic wave travelling along the direction of th e x axis is y =A cos[ω(t+l-x u)+φ].The Wave equation of plane harmonic wave travelling along the r everse direction of th e x axis is y=A cos[ω(t+l-x u)+φ].