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3. 声音的变化

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3. 声音的变化 - PowerPoint PPT Presentation


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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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slide3
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

slide4
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。

slide5
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)

slide6
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

2

3

4

slide8
拨动像皮筋

绷紧

放松

slide11
声音的高低可以用音高来描述,

音高是描述物体振动快慢的一个量。

物体振动的越快,发出的声音就越高;

物体振动的越慢,发出的声音就越低。

音高的单位:赫兹(Hz)

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