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If i look at a tree do all the electrons on the surface facing me fall out of super state because i am looking at them? I know their location..right there in front of me. Since i see the tree don't i also see the electrons that make up the tree?
Any particle can "observe" any other particle that interacts with it. The electrons atoms and molecules in the tree are continually "observing" each other as they jostle together with heat radiation. The air molecules are continually "observing" the tree and creating the air pressure that slows down the evaporation if its surface. The light photons from the sun are continually "observing" the tree by being absorbed and warming it up or being reflected and contributing to the tree's visibility To this extent a person observing the tree by looking at a few of the photons that have ben reflected from it is entirely irrelevant and has no effect on it whatever.
Well, Bill, a collapse of the wave function occurs on a particle when the probability density reaches 1 exactly.
it is most definitely not a requirement hat a sentient being has anything to do with it. Even the case of Shrodinger's cat was resolved when the light rays entering the opened box showed whether the cat was alive or dead