在O点有一波源,t=0时刻开始向下振动,形成向左传播的一列横波。t1

O点有一波源,t=0时刻开始向下振动,形成向左传播的一列横波。t1=4s时,距离O点为1mA点第一次达到波峰;t2=7s时,距离O点为6mB点第一次达到波谷。则以下说法正确的是(         

A.该横波的波长为2m

B.该横波的周期为2s

C.距离O点为4m的质点第一次达到波峰的时刻为6s

D.距离O点为4m的质点第一次开始向上振动的时刻为6s

答案

D

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