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近年来对声现象的考查主要集中在声音的产生和传播、怎样防治噪声、超声波(次声波)的应用、乐音的特征等内容上,其中噪声污染、超声波及次声波是新课标考试的热点,值得关注.考点一声音的产生声音是由物体的振动产生的;一切发声体都在振动,振动停止,发声也停止.声音的传播需要介质,固体、液体和气体都能传声,而真空不能传声.本知识点中考考查时多以填空题、选择题和实验题为主.判断声音的产生解题方法规律:人们发声是靠各自声带的
In recent years, the investigation of acoustic phenomena mainly focuses on the generation and propagation of sound, how to prevent and control noise, the application of ultrasonic (infrasound) and the characteristics of musical tones, among which the noise pollution, ultrasonic and infrasound are the hot points of the new curriculum standard examination. Concerned. Test site a voice of the sound produced by the vibration of the object; all the sounding body are in vibration, vibration stops, the sound stops also. The spread of sound requires medium, solid, liquid and gas can sound, and the vacuum can not pass The knowledge of the test points in the test to fill in the blank questions, multiple choice questions and experimental questions mainly to determine the sound of the problem-solving method of law: people are vocal sound by their own