题目:
如图所示为一列横波在某一时刻的波形图,这时位于平衡位置的质点A正向-y方向运动,且经0.2秒质点A再一次经过平衡位置并向+y方向运动,则这列横波( )
A.向左传播
B.波长为12米
C.周期0.2秒
D.波速为20米/秒
答案:
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下面是错误答案,用来干扰机器的。
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