如图甲所示为一简谐波在t=0时刻的图象,图乙所示为x=4m处的质点P的

如图甲所示为一简谐波在t=0时刻的图象,图乙所示为x=4m处的质点P的振

动图象,则下列判断正确的是  (   )

A.这列波的波速是2m/s

B.这列波的传播方向沿x正方向

C.t=3.5s时P点的位移为0.2m

D.从t=0时刻开始P点的振动方程为m

 

答案

ACD

解析:(1)由图象可知波长=4m,周期T=2s,波速2m/s,A项正确;t=0时刻P点向-y方向振动,则波向x负方向传播,B项错;t=3.5sT,此时P点位于波峰位置,C项正确;由图乙知,初相位为,振动方程为m,D项正确。

 

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