一列简谐横波向x轴正方向传播,如图12-2-15所示是某时刻波的图象,

一列简谐横波向x轴正方向传播,如图12-2-15所示是某时刻波的图象,以下说法不正确的是(    )

12-2-15

A.各质点的振幅均为2cm

B.a、c质点(水平相距半个波长)的振动方向相同

C.b质点具有正向最大速度

D.d质点具有正向最大加速度

答案

解析:因介质中各质点的振幅都相同,故A选项正确;由“坡形”法可判断a质点向下运动,b、c两质点向上运动.d质点速度为零,但加速度最大,故C、D选项正确.B选项错.

答案:B

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