問題詳情
17.( )小晴將耳朵貼在無火車行駛的觀光用鐵軌上，小雨由鐵軌的另外一端敲擊鐵軌。小晴共聽到兩次聲音，第一次由鐵軌傳來，第二次由空氣傳來，若兩次聲音的間隔相差3秒，且小晴與小雨的距離為2720公尺，則此時鐵軌中的聲速為多少？（假設此時空氣中的溫度15℃）
(A)272m/s
(B)509 m/s
(C)544 m/s
(D)1088 m/s
(A)272m/s
(B)509 m/s
(C)544 m/s
(D)1088 m/s
參考答案
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