振动具有周期重复性,质点会在不同的时刻到达同一位置,故出现多解.对于波动,波的图象的周期重复性是出现多解的原因,一般有三种情况:1.时间间隔△t与周期T的关系不明确;2.波传播的距离△x与波长λ的关系不明 The vibration has periodic repeatability, and the particles will arrive at the same position at different times, so multiple solutions occur. For the fluctuation, the periodic repeatability of the wave image is the cause of multiple solutions. There are generally three situations: 1. Time interval Δt The relationship with the period T is not clear; 2. The relationship between the wave propagation distance Δx and the wavelength λ is unknown