4-2樂音的三個特性.ppt

1、声音是怎样产生的？ 2、声音是靠什么传播? 3、什么叫介质?真空能传声吗? 哪种介质传声最快? ;第四章 声现象;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;自学提纲;乐音的三个特征：;☆一、音调;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;☆ 2、音调的高低与什么有关？;振动的快慢常用——频率表示. ___________________叫频率。 频率的单位为赫兹，简称为赫，符号为Hz。 ;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;实验： 拨动尺子力度不变，改变尺子伸出长度;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;☆ （1）、振动越快，频率越高，音调越高;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;思考：;3、女同学说话的声音“尖细”，是指女同学声音的音调_____，这是因为女同学说话时声带振动比较____的缘故．;7、如图所示，在四个完全相同的玻璃杯内装有质量不等的同种葡萄酒，用大小相同的力敲击四个玻璃杯，会发出不同的声音．这“不同的声音”主要是指声音的（　　） A．音调 B．振幅 C．音色 D．响度;知识拓展1--观察：声波的图形;; .借助仪器观察到三个声波的波形,其中,音调最高的是 ,响度最大的是 .;1.用烧水壶往水瓶里灌水时，凭经验 可以听出水瓶里水装的满不满 ，随着 水的增加，听到的声音音调越来越;;☆二、响度;振幅决定响度。 振幅越大，响度越大 ;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;☆ 2.响度是由声源振动的振幅决定的.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;☆三、音色;三、音色;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 C