Question

如圖所示為一橫波在某一時(shí)刻的波形圖，已知質(zhì)點(diǎn)F此時(shí)刻運(yùn)動(dòng)方向向下，則（　�。�

A．波向右傳播

B．質(zhì)點(diǎn)C比質(zhì)點(diǎn)B先回到平衡位置

C．質(zhì)點(diǎn)C此時(shí)刻位移為零

D．質(zhì)點(diǎn)H的運(yùn)動(dòng)方向與質(zhì)點(diǎn)F的運(yùn)動(dòng)方向相同

Answer 1

A、簡(jiǎn)諧波橫波在x軸上傳播，此時(shí)質(zhì)點(diǎn)F的運(yùn)動(dòng)方向向下，由波形平移法可知，該波沿x軸負(fù)方向傳播．故A錯(cuò)誤．
B、此時(shí)質(zhì)點(diǎn)C向下運(yùn)動(dòng)，而質(zhì)點(diǎn)B向上運(yùn)動(dòng)，則C先回到平衡位置．故B正確．
C、質(zhì)點(diǎn)C此時(shí)刻位移最大．故C錯(cuò)誤．
D、質(zhì)點(diǎn)H的運(yùn)動(dòng)方向與質(zhì)點(diǎn)F的運(yùn)動(dòng)方向相反．故D錯(cuò)誤．
故選B