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两列振幅相同、频率相同、传播方向相反的波叠加时会形成驻波。例如将弦线的一端固定在做简谐振动的振源上,另一端固定,从振源发出的一列波沿弦线向固定端传播,到达固定端后被反射回来,当弦线的张力适当时,这两列波就叠加在一起形成驻波。在中学里,用驻波讲解波的叠加、波长、波速等概念比较直观,易于理解。因中学不配备电动音叉,这里介绍一个用J0203型打点计时器(以下简称打点器)做振源的实验方法。
When two columns of waves with the same amplitude, the same frequency and opposite propagation directions form a standing wave. For example, one end of a string is fixed on a vibration source for simple harmonic vibration, and the other end is fixed. A series of waves emitted from the vibration source travels along the string to the fixed end, and are reflected after reaching the fixed end. When the tension of the string is appropriate, At this time, these two waves are stacked together to form a standing wave. In secondary schools, the concepts of wave superposition, wavelength, and wave speed are easily understood and understood with standing waves. Since the middle school does not have an electric tuning fork, here is an experimental method using the J0203 type dot timer (hereinafter referred to as the inker) as a vibration source.