【摘要】 驻波是一种重要的波的干涉现象。两个振幅相同的相干波,在同一直线上,沿相反方向传播时,叠加后成为驻波。在波形上,驻波的波节和波腹的位置始终是不变的,给人"驻立不动"的印象,但它的瞬时值是随时间而改变的。声音是一种可以听得到,却摸不着的物质,新设计的一种声驻波演示装置可以让声音跳起舞来,通过泡沫球的形态变化来观赏活泼跳跃的声音从而激发学生学习物理的兴趣。该装置操作简单,制作容易,实验现象直观明了值得推广。更多还原

【Abstract】 Standing wave is an important wave interference phenomenon.Two coherent waves with the same amplitude,when propagating on the same line in opposite directions,become standing waves after superposition.In the waveform,the position of the node and the abdomen of the standing wave is always unchanged,giving people the impression of standing still,but its instantaneous value changes with time.Sound is a material that can be heard,but can not be touched.A newly designed acoustic standing wave demonstration device can make the sound dance and watch the lively bouncing sound through the shape change of foam ball,so as to arouse students’ interest in learning physics.The device is simple to operate,easy to make,and the experimental phenomenon is intuitive and worth popularizing.更多还原