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有关简谐运动和机械波的问题,在近年来高考试题中出现得较多,试题内容新颖,难度较大,使不少学生束手无策.本人在多年的教学中,感到可以用这样一句话来概括对这类问题的解析:“波向右传,质点向左学”或“质点向左学,则波向右传”.下面举几例来阐述:例1.(1989年高考题第23题)如图1实线是一列简谐波在某一时刻的波形图,虚线是0.2s后它的波形图线,这列波可能的波速是:
Problems concerning harmonic motion and mechanical waves have appeared in many high-achieving questions in recent years. The content of the questions is novel and difficult, which has caused many students to be helpless. In my many years of teaching, I feel that I can use this phrase to summarize The analysis of this kind of problem: “waves are transmitted to the right, the particles are learning to the left” or “the particles are learned to the left, then the waves are transmitted to the right.” Here are a few examples to illustrate: Example 1. (1989 question 23) The solid line in Figure 1 is the waveform of a simple harmonic at a certain moment, and the dashed line is its oscillogram after 0.2 s. The possible wave speeds of this column are: