利用大号的低频音叉、祖棉线和金属小球可以做驻波和水波干涉的演示实验。1.驻波的形成:把粗棉线一端拴着金属小球,另一端拴在大号的低频音叉一支端(钻有孔洞),如图1所示。用橡皮小锤敲击音叉的另一支端,粗棉线因振动就出现明显波节。这就是两列同频率、同振幅的入射波和反射波互相迭加而产生的驻波现象。 Large-scale low-frequency tuning forks, ancestral cotton threads and metal balls can be used for demonstration experiments of standing wave and water wave interference. 1. The formation of standing waves: one end of a coarse cotton wire is pinched by a metal ball, and the other end is pinched on a large low-frequency tuning fork at one end (drilled hole), as shown in FIG. 1 . Using a rubber mallet to strike the other end of the tuning fork, the coarse cotton thread shows a pronounced node due to vibration. This is a standing wave phenomenon caused by two columns of incident waves and reflected waves with the same frequency and the same amplitude superimposed on each other.