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Reality is not sharp around the edges. Reality is not certain.   Share:  
Thrust of argument: Feynman writes/teaches: 'Remember that when a crystal is cooled to absolute zero, we said that the atoms do not stop moving, they still jiggle. Why? If they stopped moving, we would know where they were and that they had zero motion, and that is against the uncertainty principle. We cannot know where they are and how fast they are moving, so they must be continually wiggling in there!'

This is the uncertainty principle, Feynman tells us: 'This principle: If they were in the nucleus, we would know their position precisely, and the uncertainty principle would then require that they have a very large (but uncertain) momentum, i.e., a very large kinetic energy. With this energy they would break away from the nucleus. They make a compromise: they leave themselves a little room for this uncertainty and then jiggle with a certain amount of minimum motion in accordance with this rule.'
Direction of resistance / implied resistance: Feynman also mentions: 'philosophers have said before that one of the fundamental requisites of science is that whenever you set up the same conditions, the same thing must happen. This is simply not true, it is not a fundamental condition of science. The fact is that the same thing does not happen, that we can find only an average, statistically, as to what happens. Nevertheless, science has not completely collapsed. Philosophers, incidentally, say a great deal about what is absolutely necessary for science, and it is always, so far as one can see, rather naive, and probably wrong. For example, some philosopher or other said it is fundamental to the scientific effort that if an experiment is performed in, say, Stockholm, and then the same experiment is done in, say, Quito, the same results must occur. That is quite false. It is not necessary that science do that; it may be a fact of experience, but it is not necessary. For example, if one of the experiments is to look out at the sky and see the aurora borealis in Stockholm, you do not see it in Quito; that is a different phenomenon. 'But,' you say, 'that is something that has to do with the outside; can you close yourself up in a box in Stockholm and pull down the shade and get any difference?' Surely. If we take a pendulum on a universal joint, and pull it out and let go, then the pendulum will swing almost in a plane, but not quite. Slowly the plane keeps changing in Stockholm, but not in Quito. The blinds are down, too. The fact that this happened does not bring on the destruction of science. What is the fundamental hypothesis of science, the fundamental philosophy? We stated it in the first chapter: the sole test of the validity of any idea is experiment. If it turns out that most experiments work out the same in Quito as they do in Stockholm, then those 'most experiments' will be used to formulate some general law, and those experiments which do not come out the same we will say were a result of the environment near Stockholm.'

 

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Removal of resistance: The chapter in question deals with Quantum mechanics - it is a basic opening discussion of that subject so you don't need to know about it already to read it. So do that, if you have the mind to. Unification: Read the lectures via the link in the references below.
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References:

http://www.feynmanlectures.caltech.edu/I_02.html

 

 

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