《我们怎样听到声音》ppt课件

复习提问：1.声音是如何产生的？声音是由物体的振动产生的。2.声音是借助什么向远处传播的？声音靠介质传播。3.传播声音的介质包括哪三类？4.声音在介质中以什么样的形式传播？声音在所有介质中都以声波的形式传播。固体、液体、气体思考我们生活的世界充满了各种丰富多彩的声音，人们凭借人体的什么器官听到声音呢？人靠耳朵听声音，那么耳朵通过什么途径来感知声音？我知道：声音由产生用的形式借助物质做向传播物体振动声波介质四面八方1.人耳的构造：耳廓外耳道耳垂外耳鼓膜听小骨鼓室中耳半规管前庭耳蜗内耳咽鼓喉外耳中耳内耳人耳分为：外耳中耳内耳三部分。耳廓外耳道鼓膜听小骨耳蜗听神经中耳、内耳在头的里面，我们看不见。听神经与耳蜗相连。科技视窗：听到声音的两种途径.swf科学探究：我们怎样听到声音.swf科学认知：耳朵听声的原理.swf2.人感知声音的过程声波与水波相似，音叉振动使它周围的空气也象水似的，产生波动，并向四周传播。外界传来的声波引起鼓膜振动这种振动经过听小骨及其他组织，传给听觉神经听觉神经把信号传给大脑，这样人就听到了声音声波传到耳朵后，答：声波通过外耳道传到鼓膜，引起鼓膜振动，鼓膜的振动又通过听小骨传给耳蜗，连接耳蜗的听神经把声音信号报告给大脑，我们就听到声音了。声波耳廓外耳道鼓膜听小骨耳蜗听神经大脑集中声波，使听到的声音更清晰。（通道传声原理）增大耳廓，收集更多的声波。◆耳廓有什么作用？耳廓具有收集声波的作用。◆制作一个喇叭状的“助听器”来体验一下。？这些声音听起来舒服吗？我们常叫它什么音？噪音是听起来不舒服的声音。听到巨大响声时要把口张开有些声音让我们心情愉悦，但也有一些声音听了让人不舒服。说说日常生活中，哪些声音会让我们感觉到不舒服？://hkjum349195.51sole.com/://hkjum482409.51sole.com/://35319222.51sole.com/://=109/://51sole1920962.51sole.com/://51sole1920962.51sole.com/://ztblg2013.51sole.com/://chitengana.51sole.com/://hkjum14714.51sole.com/://swaitlam.51sole.com/://wanfeng227.51sole.com/://wallacechu.51sole.com/://://://ppcxzhh.51sole.com/://1532284.51sole.com/://ca2000.51sole.com/://hkjum390913.51sole.com/://jixiegy.51sole.com/://://://wanfeng227.51sole.com/://c0d077.51sole.com/://chitengana.51sole.com/://szcwdl.51sole.com/://hkjum217179.51sole.com/://hkjum285458.51sole.com/://1855978.51sole.com/://://hafly01.51sole.com/://lijin123.51sole.com/://guoyin12.51sole.com/://guoyin12.51sole.com/://fj592039.51sole.com/://szjhtgc.51sole.com/://szjhtgc.51sole.com/://CC512006.51sole.com/://muhaiqi.51sole.com/://min132.51sole.com/://sxchangqing.51sole.com/://fcmg12.51sole.com/://hkjum285458.51sole.com/://sjx123.51sole.com/://wang003233.51sole.com/://c0d077.51sole.com/://sdqjl8888.51sole.com/://ouyangzj.51sole.com/://1855978.51sole.com/://lijin123.51sole.com/://swaitlam.51sole.com/://1855978.51sole.com/://sxchangqing.51sole.com/://lkhj12345.51sole.com/://lkhj12345.51sole.com/://hcoa01.51sole.com/://hcoa01.51sole.com/://xialongfc.51sole.com/://shengyi20110101.51sole.com/://shengyi20110101.51sole.com/://shengyi20110101.51sole.com/://wang003233.51sole.com/://znxk123.51sole.com/://://lin889.51sole.com/://nxz7z8xg.51sole.com/://szblz99.51sole.com/://chitengana.51sole.com/://sjx123.51sole.com/://twp222.51sole.com/://twp222.51sole.com/://wanfeng227.51sole.com/://sxchangqing.51sole.com/://51sole1446708.51sole.com/://li950217.51sole.com/://qiuqiu168900.51sole.com/://ppcxzhh.51sole.com/://xialongfc.51sole.com/://wallacechu.51sole.com/://wanfeng227.51sole.com/://sxwl006.51sole.com/