第十四章 第2讲 机械波
第2讲 机械波一、机械波1.形成条件(1)有发生机械振动的波源.(2)有传播介质,如空气、水等.2.传播特点(1)传播振动形式、传播能量、传播信息.(2)质点不随波迁移.3.机械波的分类(1)横波:质点的振动方向与波的传播方向相互垂直,有波峰和波谷.(2)纵波:质点的振动方向与波的传播方向在同一直线上,有疏部和密部.4.机械波的描述(1)波长(λ):在波动中,振动相位总是相同的两个相邻质点间的距离.①在横波中,两个相邻波峰(或波谷)间的距离等于波长.②在纵波中,两个相邻密部(或疏部)间的距离等于波长.(2)频率(f):波的频率等于波源振动的频率.(3)波速(v):波在介质中的传播速度,由介质本...
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