3. 声音的变化

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# 3. 声音的变化 - PowerPoint PPT Presentation

3. 声音的变化. 振动幅度. 观察比较声音强弱的变化. 1 、轻轻拨动尺子 2 、用力拨动尺子. * 观察声音的强弱，以及振动的幅度. 观察比较声音强弱变化. 振动幅度小 声音弱（小 ). 振动幅度越大 声音强 ( 大 ). 音量是由物体振动的幅度决定的，振动幅度越大，声音就越强；振动幅度越小，声音就越弱。. 声音的强弱可以用 音量 来描述。 振动幅度越大，声音越强； 振动幅度越小，声音越弱。 音量的单位：分贝（ dB ）. 观察比较声音高低的变化. 用铅笔或小木棒敲击杯口，预测他们发出的声音会有什么变化？. * 学会用高、较高、较低、低来描述. 1.

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## PowerPoint Slideshow about ' 3. 声音的变化' - sally

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Presentation Transcript

1、轻轻拨动尺子

2、用力拨动尺子

*观察声音的强弱，以及振动的幅度

*学会用高、较高、较低、低来描述

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