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If you have a small diapragm moving slowly then the air will just flow around it and you won't get any appreciable pressure rise in front of the diaphragm. That means there won't be any longitudinal pressure waves (i.e. sound waves) generated normal to the diaphragm surface. If you now make the diaphragm larger the air has farther to move to get to the ...


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There exists a good answer to what is color which stresses that the question is mainly about physiology of the eye. I will address the last part: Basically, what properties of the paint material makes it absorb the red wavelength the least? Light has a specific wavelength . If that wavelength impinges on the eye receptors, it gives the colors we have ...


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Any waves that appear on one side of an interface must immediately leave on the other side. There's no room to queue them up. This means that in a frame where the interface is at rest, the frequency on both sides is always the same. Once you have that, then it becomes obvious that the wavelength in air will always be the same as well. So from the ...



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