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笔者在一次学生平时测验中,意外发现一条机械波的选择题错误率相当高,题目如下: 图1,是一简谐运动横波的图像,波速为0.2 m／s,以下所给的结论正确的是: A.振源的振动频率为0.4 Hz.
In a student’s usual time test, the author unexpectedly discovered that the error rate of a multiple-choice mechanical wave problem is quite high. The problem is as follows: Figure 1 is an image of a harmonic motion transverse wave with a wave velocity of 0.2 m/s. The following conclusion is correct. : A. The vibration frequency of the vibration source is 0.4 Hz.