橫波以波速u沿X軸負(fù)方向傳播,t時(shí)刻波形曲線如圖。則關(guān)于該時(shí)刻各點(diǎn)的運(yùn)動(dòng)狀態(tài),下列哪一個(gè)敘述是正確的?()
A.A點(diǎn)振動(dòng)速度大于零 B.B點(diǎn)靜止不動(dòng) C.C點(diǎn)向下運(yùn)動(dòng) D.D點(diǎn)振動(dòng)速度小于零
A.y=Acos(2πt/T-2πx/λ-1/2π) B.y=Acos(2πt/T+2πx/λ+1/2π) C.y=Acos(2πt/T+2πx/λ-1/2π) D.y=Acos(2πt/T-2πx/λ+1/2π)
A.f(x,t)=Acos(ax+bt) B.f(x,t)=Acos(ax-bt) C.f(x,t)=Acosax·cosbt D.f(x,t)=Asinax·sinbt