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3. 声音的变化

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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3. 声音的变化

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  1. 3.声音的变化

  2. 振动幅度

  3. 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

  4. 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。

  5. 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)

  6. 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

  7. 观察比较水杯声音高低变化

  8. 拨动像皮筋 绷紧 放松

  9. 振动快

  10. 振动慢

  11. 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)

  12. Goodbye

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