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近年来高考对“机械振动与机械波”这一部分内容的考查多以选择题的形式出现,主要利用图象考查简谐运动的特点和波传播的空间关系,要想解决这一类问题,就需要通过对振动图象和波动图象的分析,找到波长、周期及超前滞后的关系,综合应用知识解决振动与波的相关问题.一、根据波动图象确定某一质点的振动情况【例1】一列沿x轴传播的简谐横波某时刻的波动图象如图1甲所示,若从此刻开始计时,
In recent years, college entrance examination on the “mechanical vibration and mechanical wave” part of the content of the test in the form of multiple choice, the main use of images to investigate the characteristics of simple harmonic motion and the spatial relationship of wave propagation, in order to solve this type of problem, It is necessary to find out the relationship between wavelength, period and lead lag by analyzing the vibration image and the fluctuating image, and to apply the knowledge to solve the vibration and wave related problems.Firstly, to determine the vibration of a certain particle according to the fluctuating image 1] A row of simple harmonic shear waves propagating along the x-axis at a time The fluctuation image shown in Figure 1 A, if from the moment start timing,