f2物理計算題1題急急明天要交

🎓 學業台小學及中學教育

嘉儀

2010-09-17 2:45 am

要過程，有步驟
1.)聲音遇到障礙物能向相反方向傳播。一個同學向一口枯井的井底大喊一聲，經過1.5s聽到回聲，那麼這口枯井的深度大約多少米?(聲速按340m/s計算)

回答 (2)

[匿名]

2010-09-17 2:51 am

✔ 最佳答案

Let the depth be x m

Distance travelled by the sound wave = 2x m

340 (1.5) = 2x
x = 255

so the depth is 255 m.

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Ally

2010-09-17 2:55 am

(1.5x340)/2
=510/2
=225m

2010-09-16 19:58:48 補充：
because聲速按340m/s計算,and1.5s聽到回聲,so1.5sx340=聲音在枯井來回的雖離,
即2口枯井的深度,so除2=1口枯井的深度.

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