同重量有關??
請用簡單方式解釋(比小朋友易明D)
thx!!!!
更新1:
但我發覺放多D棉花大力搖係有聲,要靜的環境, 係味本身係有聲,但細聲到聽不到?,
(急問!)物體碰撞會產生聲音,點解搖一個放左綿花的樽會冇聲?
回答 (5)
2012-03-11 3:13 am
✔ 最佳答案
Sound is produced by vibration of matters. Cotton wool is soft and contains plenty of air sacks. When the cotton wool collides with the bottle, the air sacks act as cushion and which prevent the glass bottle to vibrate. Thus no sound is produced.
2012-03-17 6:25 am
Since cotton wool is a vibration absorber
2012-03-11 3:15 am
因為棉花是軟的,而且是凹凸不平的,希望能幫到你
2012-03-10 19:16:42 補充：
支持我
2012-03-10 19:16:42 補充：
支持我
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120310000051KK00564