先敲音叉在靠近乒乓球好一些
因为如果先贴住乒乓球的话,敲音叉时就算音叉不发出声音,乒乓球也会弹起
探究振幅与响度关系的实验中,先敲击音叉再靠近乒乓球合理还是先贴近乒乓球再敲击音叉合理?
探究振幅与响度关系的实验中,先敲击音叉再靠近乒乓球合理还是先贴近乒乓球再敲击音叉合理?
物理人气:274 ℃时间:2019-11-05 21:05:54
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