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      欢迎来到原中小学教育资源网!

      物理《声现象》复习课件

      课件 时间:2017-06-23 我要投稿
      【www.dnfdy.com - 课件】

        下面瑞文网小编为大家提供了物理《声现象》复习课件。

        一、声音是什么第一章声现象(复习)

        1、声音是由于发声体的______产生的。一切发声的物体都在_____。固体、液体、气体都可以发声。_____停止,发声也停止。第一章声现象(复习)

        (注意:振动一定会发声,但发出的声音人不一定会听到;如果物体不振动,是决不会发出声音的)第一章声现象(复习)

        2、声音的传播第一章声现象(复习)

        (1)声音的传播需要__ __,一切固体、液体和气体都可以作为_ ____,声音在介质中以波的形式传播,叫做___ __。第一章声现象(复习)

        (2)_____ 不能传声。第一章声现象(复习)

        (3)声音在不同介质中传播的速度不同。声音在固体中传播速度最快,其次是液体,气体的传播速度最慢。

        3、声波能使物体振动,能粉碎小石头,这表明声音具有 。第一章声现象(复习)

        二、声音的特征

        1、声音的三要素第一章声现象(复习)

        (1)声音的三要素是指声音的___ _、_____和______。第一章声现象(复习)

        (2)音调指声音的_______,是由物体振动的_______决定的;响度指声音的_____,是由物体振动的________决定的;我们能分辨不同人的声音,依据的是声音的________。第一章声现象(复习)

        (3)

        声音的特征

        响度

        音调

        音色

        影响因素

        振动的

        声源的远近

        振动的

        发声体的材料、结构

        改变方法

        改变力的大小

        改变发声体的长短、粗细、松紧

        举例

        震耳欲聋

        脆如银铃

        悦耳动听

        说明

        1、 频率: ,单位:

        2、 振幅:振动的幅度

        2、用一把直钢尺完成下列探究实验:

        (1)探究声音的响度与声源的振幅有什么关系?

        (2)探究声音的音调与声源振动的频率有什么关系?

        (1)实验方法:将钢尺一端放在桌面上,用手按住,另一端伸出桌面外( 相同)。第一次 拨钢尺,使钢尺振动发声;第二次 拨钢尺,使钢尺振动发声。

        现象:第二次比第一次的响

        结论:振幅越大, 。

        (2)实验方法:将钢尺一端放在桌面上,用手按住,另一端伸出桌面外(用大小相同的 拨动钢尺)。第一次伸出的 一些,使钢尺振动发声,此时钢尺振动的 ;第二次伸出的 一些,使钢尺振动发声,此时钢尺振动的 。

        现象:第二次比第一次音调低

        结论:振动越慢, 。

        三、令人厌烦的噪声

        1、噪声的来源、危害和控制第一章声现象(复习)

        (1)划分声音强弱等级的单位是_ __,用符号“dB”表示。第一章声现象(复习)

        (2)减弱噪声的方法有:从噪声的_________、_________和________三个环节来防治。第一章声现象(复习)

        2、从环境;さ慕嵌瓤,凡是影响人们正常学习、工作和休息的声音都属于噪声。

        四、人耳听不见的声音第一章声现象(复习)

        1、由于人耳听到声音的频率范围是_ __Hz~_______Hz,在这个范围以内的声音称为可听声。人们把频率低于____Hz的声音叫做__ ___,频率高于_____Hz的叫做___ __。

        2、超声波具有 , ,易于获得较为集中的声能等特点。生活中的应用:声呐、B超图像、超声波清洗器、超声波焊接器

        3、次声波可以传的很远,容易 。一定强度的次声波对人体会造成伤害。

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