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在应用声现象知识解决问题时,由于部分同学对声现象的概念理解出现偏差,忽视物理情景与声现象知识的联系,易导致错解的产生.易错点一:对声音的传播和接收理解易错1.声音的传播需要介质,介质既可以是固体、液体,也可以是气体;真空不能传声.部分同学容易误认为声音的传播不需要介质.2.声音是由物体的振动产生的,但并不是所有的声音人耳都一定能听到.人耳能听到声音需要同时满足四个条件:一是发声体在振动,二是有介质传播,三是声音振动的频率在人耳的听觉范围内,四是要有健全的耳朵接收.部分同学容易错误地理解为只要是声音,人耳一定能够听到.
When applying acoustic phenomenology to solve the problem, some students may deviate from the conceptual understanding of the acoustic phenomena and neglect the connection between the physical situation and the acoustic phenomena, which may easily lead to the misunderstanding. Easy to get wrong 1. The spread of sound requires medium, the medium can be solid, liquid, gas can also be; vacuum can not pass some students easily mistaken for the sound of the media do not need .2 sound is generated by the vibration of the object , But not all of the human voice can hear the human ear can hear the sound needs to meet the four conditions at the same time: First, sounding body vibration, the second is the media, the third is the frequency of sound vibration in the human ear Of the auditory range, the fourth is to have a sound ear to receive some students easily mistakenly understood as long as the voice, the human ear must be able to hear.