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範例:聲波與測距[99學測]

救難隊欲發射拋繩器，以繩索連接河谷兩岸。一名隊員連續拍手，估計對岸峭壁距離。他愈拍愈快，當6秒拍手20次時，拍手節奏與回音同步。已知空氣中聲速為340公尺/秒，則該隊員與河谷對岸峭壁的最短距離約為多少公尺？(A)340 (B)120 (C)100    (D)50 (E)20

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Posted in 歷屆學測(推甄)考題, 波的性質.

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By 張慶堂 – 2015 年 01 月 09 日

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