16.一列簡(jiǎn)諧橫波在均勻介質(zhì)中沿x軸正方向傳播,t=3s時(shí)波傳到x=9m處的質(zhì)點(diǎn)B,其波形如圖甲所示,A質(zhì)點(diǎn)的振動(dòng)情況如圖乙所示,求:
(i)從t=3s時(shí)開(kāi)始C質(zhì)點(diǎn)經(jīng)過(guò)多長(zhǎng)時(shí)間位移第一次為4m;
(ii)在簡(jiǎn)諧橫波從B質(zhì)點(diǎn)傳到C質(zhì)點(diǎn)的過(guò)程中,A質(zhì)點(diǎn)運(yùn)動(dòng)的路程。