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範例:二維波動的干涉[85日大]

S1S2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 (B)172 (C)316 (D)316 (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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