在“波的干涉”教学演示实验中,常用电动振子在浅水盘中振动,产生水波干涉现象。其优点是实验简单,使学生观察到真实的现象。缺点是,水盘尺寸较小,为了获得较好的干涉图样,要求波长较短,振动频率较高,因而振动过程太快,难以看清。 In the “wave interference” teaching demonstration experiment, commonly used vibrator vibration in the shallow water dish, resulting in wave interference phenomenon. The advantage is that the experiment is simple, so that students observe the real phenomenon. Disadvantage is that the smaller size of the water tray, in order to obtain a better interference pattern requires a shorter wavelength, higher vibration frequency, so the vibration process is too fast, hard to see.