从普物知,机械振动在介质中传播的过程可简称为波。由此可知,机械波是由机械振动产生的,没有机械振动,也不会有机械波,机械波携带的能量是由机械振动提供的。既然如此,为什么作机械振动质点的动能与势能反相位,而波的动能与势能却同相位呢?后一问题 From general knowledge, the process of mechanical vibration propagation in a medium can be simply called a wave. It can be seen that the mechanical wave is generated by mechanical vibration, there is no mechanical vibration, there is no mechanical wave, the energy carried by the mechanical wave is provided by the mechanical vibration. Since this is the case, why is the kinetic energy of the mechanical vibration particle in anti-phase with the potential energy, and the kinetic energy and potential energy of the wave are in the same phase? The latter problem