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o db you sheng yin ma
Author(s): 
Pages: 89-90
Year: Issue:  Z1
Journal: School Journal of Mathematics

Keyword:  声强级声音频率响度振动声波传播条件达人物体同学;
Abstract: <正>有些初中物理资料在讨论人听到声音的条件时,列出了必须满足的下列条件: (1)一定要有正在振动的物体,即发声体. (2)振动的物体和人耳之间必须有能够传播声音的介质.
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