What is an observer in quantum mechanics?
I'm sick of quantum physics explanations which term experiments where the outcome depends on "if you observe it or not". For example, the two-slit photon experiment.
I figure that something physical happens, irrespective of if a "being" of some kind is there to consciously watch it.
Is it really to do with absorption and emission? Like the only way to know for sure where a photon is, you need to have it absorbed and re-emitted by an atom/electrons so that you can detect it (on one level, seeing with your eyes is about absorbing photons on the atoms in your eye and having that create a potential on your nerves which can travel through your brain).
So in a sense, if a tree fell in the forest and nobody heard, it still would have fallen because the atoms in the tree would have absorbed thermal energy, and the atoms of the tree would have caused a vibration in the tree and the ground, which vibrated the air, and so this energy would have dissipated into the environment, and that counts as observation without a human ever getting involved?
Do I understand things or am I very wrong?