作业帮SAT2 waves 巴朗上一道题
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SAT2 waves 巴朗上一道题
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 centimeter apart,and the speed of sound in air is 330 meters.
Q：the wavelength of this sound in air is?
答案为什么是 2 cm?
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 centimeter apart,and the speed of sound in air is 330 meters.
Q：the wavelength of this sound in air is?
答案为什么是 2 cm?
额.我不知道有多少人可以看懂你的题,但是至少我明白了.
这道题的sound speed是迷惑条件,powder的分布与它无关.
The waves set up by diaphragm 在tube的另一端反射回来,与入射的waves叠加形成驻波.
因为tube中除了波节处空气都在震动,只有波节处是稳定位置,因此fine powder一定聚集在驻波波节处.由fine powder分布可知,两波节间距为1cm,波长为二倍波节间距,因此wavelength is 2cm
这道题的sound speed是迷惑条件,powder的分布与它无关.
The waves set up by diaphragm 在tube的另一端反射回来,与入射的waves叠加形成驻波.
因为tube中除了波节处空气都在震动,只有波节处是稳定位置,因此fine powder一定聚集在驻波波节处.由fine powder分布可知,两波节间距为1cm,波长为二倍波节间距,因此wavelength is 2cm