(达州专版)2019中考物理第一单元声和光第1课时声现象复习课件.ppt

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一轮考点复习,学生用书P1,声源,振动,发声,介质,不能,声波,340,固体,液体,气体,反射,能量,频率,频率,音调,响度,音色,距离,振幅,振幅,接收处,无规则,声源,传播过程中,20 000,20 000,20,20,声音是由物体振动产生的,能量,信息,越高,声音是由物体振动产生的,越慢,越快,越低,频率,响度,较大,较大,较小,振幅,较小,学生用书P29,A.拉小提琴时, 手在不同位置按弦, 是为了改变响度,B.抽出罩内空 气,听到闹钟 的声音变小, 说明发声体在振动,C.道路两旁设 置隔音墙,是 为了防止道路 上的汽车发出 噪声,D.发声的音叉 靠近乒乓球, 球多次被弹开, 说明发声体在 振动,D,学生用书P2,C,C,学生用书P3,B,D,C,B,【正解】 A,学生用书P3,D,C,D,甲,乙,B,D,C,B,音色,振动,西,变小,响度,声源处,A,B,C,10.88 s,850,510,

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