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统编教材把简谐波在弹性介质中传播时介质质点的连续振动,看作像谐振子的自由振动那样,归结为是邻近质点给予的弹性力和质点本身的惯性联合作用的结果,这是一种严重的疏忽。实际上,在介质中不管是波源还是其它质点的振动都是一种强迫振动,在这里,弹性力不仅是一种恢复力,而且也是前邻质点给予它和它给予后邻质点的推动力。
The textbook compiles the simple vibration of a harmonic medium propagating in the elastic medium as a free vibration of a harmonic oscillator, which is attributed to the combined effect of the elastic force given by the neighboring particle and the inertia of the particle itself A serious negligence. In fact, the vibration in a medium, whether it is a wave source or other particles, is a forcing vibration, where the elastic force is not only a kind of restoring force but also the propulsion force given by the anterior parenchyma and its posterior parenchyma.