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範例:二維波動的干涉[85日大]

S1、S2兩個喇叭，分別置於y=12公尺，x=±2.5公尺處(如圖所示)，由同一電源驅動發出相同的單頻聲音。一觀測者在x軸的不同位置上可聽到音量有大小起伏的變化。已知音量在原點時最大，往右移則音量漸小，當移至x=2.5公尺處時，音量最小。若聲速為344公尺/秒，則喇叭之音頻為(A)158赫 (B)172赫 (C)316赫 (D)316赫 (E)502赫。[85日大]


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Posted in 歷屆物理考題, 水波的干涉與繞射.

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By admin – 2009 年 10 月 07 日

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