【摘要】 本文介绍了声波干涉、反射的两种物理演示仪器的研制 ,一种是通过调节波导管中液面的高度形成驻波 ,实现对声速的测量 ;另一种是由一个信号发生器驱动两个扬声器 ,这两个相干的声源在自由空间中形成强弱变化的声波干涉。本文分别介绍了这两种装置的原理、制作及使用效果。更多还原

【Abstract】 Two instruments for velocity measurement and interference with sound wave are designed and constructed.One is a sound’s velocity measurement instrument by adjusted the level of liquid surface in a wave-guide,when the length of wave-guide which above the liquid surface is satisfied the condition of standing wave,the velocity of sound can be measured easily with the volume.Another is an instrument about interference of the sound,with two speaker which driven by a low frequency signal generator simultaneously,one can hear the interference pattern easily in the classroom.The results measured by the two instruments are also publicized in this paper,which is satisfied.更多还原