《声音是怎么产生的》(第五册第七课)主要通过实验使学生懂得声音产生的有关科学道理,培养他们的操作、归纳、推理的能力。由于学生区分声音的高低与强弱有某些混淆,观察物体振动频率的快慢有一定的困难,因此,这是本课的难点。教学时,只要求学生获取“长的、粗的、松的、厚的等发出的声音低;短的、细的、紧的、薄的等等发出的声音高”的感性认识,要求掌握“振动频率快的 “How Sound Produces” (Volume 5, Lesson 7) Experimentally empowers students to understand the science of sound and to develop their ability to manipulate, summarize, and reason. As the students distinguish between the level of sound and the strength of some confusion, it is difficult to observe the speed of the object vibration frequency, therefore, this is the difficulty of this lesson. In teaching, students should only be asked to acquire the perceptual knowledge of “the sounds of long, thick, loose, thick, etc. are low; the voices of short, thin, tight, thin, etc. are high” Vibration frequency fast