图10-2-7所示是一列横波某时刻的波形图,若已知质点C正向上振动,

图10-2-7所示是一列横波某时刻的波形图,若已知质点C正向上振动,则

A.此波向右传播

B.DC先回到平衡位置

C.此时B点速度为正,加速度为正

D.再过T/2,A到达波峰

答案

解析:已知C质点向上运动,可知B质点也向上运动,C质点的运动超前,C、B两质点相比较,C为前一质点,B为后一质点,波从右向左传播.再经T/2,质点A将再回到平衡位置.

答案:BC

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