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In quantum physics the results of experiments on a particle can depend on all of the states the particle can be in during the experiment: this is called quantum interference. For an electron attached …

Suppose that the electron gun produces a pulse of electrons with frequency distribution $f(k)$ and consider the wave function far away from both the detector and the gun, where you can approximate it as …

Imagine there is an electron gun that is capable of emitting 1 electron at a time, the gun emits an electron directed at an empty space, no dust, no matter or anything that could interact with the el …

The same explanation involving multiple versions is true for every other kind of particle in your body: electrons, protons, neutrons etc. …

If a system is undergoing interference and information is copied out of that system that tends to suppress the interference: this process is called decoherence. For macroscopic objects this is usually …

An electron is not a point particle. Point particles don't exist. The world is governed by quantum mechanics, which describes physical systems in terms of quantum mechanical observables, which are rep …

Some people advocate the Copenhagen interpretation, which claims that observers are fundamental for some unexplained reason. But the equations of motion of quantum systems say nothing about observers, …

It doesn't magically make electrons change. For some more details on how measurement can be understood see https://arxiv.org/abs/quant-ph/0306072 There is a quantum theory of electromagnetism. …

In quantum theory the outcome of experiments in general depends on what happens to all of the possible states of that system because of quantum interference, see Section 2 of this paper for an example …

Your question has several flaws. First, you say the electron is at rest at the origin. As John Rennie noted, this implies that the position and momentum are both sharp, which contradicts the uncerta …

pattern changes if you introduce a second slit, so there must be something coming through the second slit that prevents the electron from arriving at P and that thing is blocked by substances that block electrons …

Quantum theory describes systems in terms of observables $\hat{X}$ and states $\rho$. The expectation value $\langle\hat{X}\rangle$ of an observable $\hat{X}$ with possible values $x_1,x_2\dots$ is $ …

Electrons are just quanta of the electron field. … If you actually have two electrons they can interfere because of the Pauli exclusion principle, which states that no two electrons can occupy the same quantum state. …

Electrons bound to an atom are interacting a lot more weakly with their environment and they do undergo interference so it is not a good approximation to look on them as having a single position or momentum … There are aspects of chemistry that are explained by electrons having relativistic momenta such as the colour of gold: https://www.researchgate.net/profile/Pekka-Pyykkoe-2/publication/221690646_Relativistic_Effects_in_Chemistry_More_Common_Than_You_Thought …

Such systems are usually found in energy eigenstates as a result of decoherence: https://arxiv.org/abs/quant-ph/9811026 So electrons are usually found in orbitals. …