問題詳情
33.一單頻聲波於長管中傳播，如圖所示，同時顯示此時刻中各點空氣分子相對平衡位置之位移，與管內各點速度（或壓力）的關係圖。下列敘述何者正確？
(A)疏部中點空氣分子對其平衡位置之位移為最大
(B)密部中點之空氣分子對其平衡位置之位移為最大
(C)疏部中點空氣壓力為零
(D)密部中點空氣分子速率為零
(E)相鄰之疏部中點與密部中點空氣分子速度方向相反。 
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