波的传播和介质各质点的振动之间有着密切的内在联系,在求解这类问题时,如果质点振动或波的传播方向不确定或波的传播时间或距离不确定等,就容易出现多解的现象;如果同学们在解题中又不能透彻全面地分析题意、合理地使用已知条件,就会造成解答不完整,或是用特解代替通解的现象 There is a close relationship between the wave propagation and the vibration of each point of the medium. When solving such problems, if the particle vibration or wave propagation direction is uncertain or the wave propagation time or distance is uncertain, etc., multiple solutions are easy to occur If students can not fully and thoroughly analyze the questions in the problem solving and use the known conditions reasonably, it will result in incomplete solutions or special solutions instead of common solutions