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不少的习题集或练习册中,都有这样一道练习题:“在如图1所示的一列横波的波形图象中,沿彼的传播方向A、B、C、D、E、F等质点,这些质点中势能最大的是__,动能最大的是__。”(所给的答案是:势能最大的质点是A、C、E,动能最大的质点是B、D、F)。学生解答此题时,得出的结论与此完全一致,其理由是:波在传播过程中,媒质中各质点都相对于平衡位置作简谐振动,因为作简谐振动的质点在最大位移处势能最大,动能最小,在平衡
In many problem sets or workbooks, there is such an exercise: "In the waveform image of a row of transverse waves as shown in Figure 1, along its propagation direction A, B, C, D, E, F, etc. The largest potential energy in these particles is __, and the largest kinetic energy is __.” (The answer given is: The largest particles of potential energy are A, C, and E. The particles with the largest kinetic energy are B, D, and F). When a student answers this question, the conclusion reached is exactly the same. The reason is that in the propagation process of the wave, all the mass points in the medium are in simple harmonic vibration with respect to the equilibrium position, because the mass point for simple harmonic vibration is at the maximum displacement. Potential energy is largest, kinetic energy is minimal, and balance is