一道物理题,sat2的.高中没学到这里,自己也不是很懂.A vibrating diaphragm sets up strong vibrations at the mouth of a horizontal tube containing air and a small amount of fine powder.The powder becomes arranged in piles 1 cm apart,and
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一道物理题,sat2的.高中没学到这里,自己也不是很懂.A vibrating diaphragm sets up strong vibrations at the mouth of a horizontal tube containing air and a small amount of fine powder.The powder becomes arranged in piles 1 cm apart,and
一道物理题,sat2的.高中没学到这里,自己也不是很懂.
A vibrating diaphragm sets up strong vibrations at the mouth of a horizontal tube containing air and a small amount of fine powder.The powder becomes arranged in piles 1 cm apart,and the speed of sound in air is 330 meters per seconds.
The wavelength of this sound in air is?
我的理解是一个2cm的管子，两边开口，中间各种fine powder，然后让它震动。
类似于一边closed pipes vibrating air columns，怎么算，怎么求。ToT....
是不是wavelength=4 the length of air columns?
那答案不就成了4cm了，可是答案是2cm.
大哥们，不是求翻译。不需要你复制粘贴，然后google translate。
一道物理题,sat2的.高中没学到这里,自己也不是很懂.A vibrating diaphragm sets up strong vibrations at the mouth of a horizontal tube containing air and a small amount of fine powder.The powder becomes arranged in piles 1 cm apart,and
由题意可知,这些粉末在每隔1 cm的地方聚集.而这些聚集点为波的振动薄弱处,也就是sin波形图的平衡位置.它们之间相距半个波长,所以波长为2×1 cm= 2 cm.