读者:湖南新化十中物理教师戴迦南同志来信指出:看了《物理教学》1982年第3期中杨雄生同志写的“振动和波的复习”之后,对其中第16页上习题3的提法有点异议。其中习题3:介质中振源的振动图象如附图所示,试在介质中画出附图所示时间内的波形图象。我们知道:振动图象描述的是做简谐振动的一个 Reader: Comrade Dai Gannan, a physics teacher from Shihua University in Xinhua, Hunan, pointed out that after reading the “Review of Vibration and Waves” written by Comrade Yang Xiongsheng in the 3rd issue of physics teaching in 1982, he took questions on page 16. The formulation of 3 is somewhat disagreeable. Among them, Exercise 3: Vibrating image of vibration source in the medium As shown in the drawing, try to draw waveform images in the medium for the time shown in the figure. We know that the vibration image describes one of the harmonic vibrations