试题与答案

小琦学习了有关声音的知识后,对材料的隔音性能很感兴趣,于是他设计了如下实验进行探

题型:问答题

题目:

小琦学习了有关声音的知识后,对材料的隔音性能很感兴趣,于是他设计了如下实验进行探究.

实验步骤:

(1)先搜集各种材料,如衣服、报纸、平装书、塑料袋、袜子;

(2)把钟放到一个鞋盒里,将衣服盖在盒上方,然后逐渐离盒子直到听不见滴答声,记下此时人离盒子的距离.

(3)分别将各种材料盖在盒上方,重复以上实验,得到下表的数据.

材料衣服报纸平装书塑料袋袜子
听不见滴答声的实际距离2.12.83.75.21.2
回答问题:

(1)小琦设计的实验利用了离声源越远,听到的声音响度越______(填“大”或“小”)的原理.

(2)根据小琦所得数据可知粗糙材料比平滑材料的隔音性能______(填“好”或“坏”).原因是粗糙材料吸收声音的性能要比平滑材料______(填“强”或“弱”).

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A

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