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机械波 PowerPoint PPT Presentation


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机械波. 引言. 机械波 : 机械振动在弹性介质中传播. 电磁波 : 变化电磁场在空间的传播.   他们具有波动的共同或相似的特性,如数学表达式,传播速度,振幅 ……. 一 机械波的几个基本概念. 1、机械波的产生. 观察几种机械波: 横波,纵波.   当弹性介质中的一部分发生振动时,由于介质各个部分之间的弹性力间的相互作用,振动就由近及远的传播出去,可见. (1)机械波实质上是介质中大量质元参与的集体振动. (2)机械波产生的条件是波源和弹性介质. (3)沿波的传播方向各质元的相位依次落后      ,或者说沿波的传播方向上, 后一质元重复前一质元的运动状态.

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机械波

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