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《声现象》这一章内容,由于教材介绍简单,学生实际经验少,在学习中很容易形成一些错误认识,并带入将来的学习中.教师在教学中要注意适当拓展知识面,引导学生纠正错误认识.错误认识一:声音随声源振动的停止而消失.乍一想,跟已有经验相符,声源停止振动,声音马上消失.如日常生活中敲锣打鼓时,用手按住锣面或鼓面,声音迅速消失,其它常见的跟声有关的现象也大抵如此.其实,教材上对此有阐述:正在发声的物体都在振动,振动停止,发声也停止.可见发声停止与声音消失是有区别的.
The content of the chapter “Sound Phenomenon”, due to the simple introduction of teaching materials and practical experience of students, it is easy to form some misunderstandings in learning and bring them into future learning. Teachers should pay attention to appropriately expand knowledge and guide students in teaching. Correcting misunderstandings. Misunderstanding 1: The sound disappears with the stop of the vibration of the source. At first glance, in accordance with existing experience, the sound source stops vibrating and the sound disappears immediately. If you beat a drum in your daily life, hold it by hand. Faces or drums, the sound quickly disappears, and other common sound-related phenomena are also largely the case. In fact, the teaching materials have elaborated on this: the sounding objects are all vibrating, the vibration stops, and the vocalization stops. The visible sound stops and The disappearance of sound is different.