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Does the energy of electron moving through a vacuum chamber remain constant? [closed]
If an electron moves through a vacuum chamber of infinite size, What will happen of its energy? Does it (energy of the electron) remain constant until it interacts with the other object?
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In an electron-positron annihilation, in what direction are the photons released?
I read that, in an electron-positron annihilation, at least 2 photons are produced, because of the law of conservation of momentum.
my question is: in what direction are those photons released? and ...
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