SAT2 waves 巴朗上一道题
问题描述：
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?
答
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...