A free electron in a total vacuum

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If you were to release a free electron in a total vacuum what would its behavior be?

Say you released it from the center of a sphere with a surface capable of detecting the electron when it comes in contact. Wouldn't you be able to calculate the speed and direction of the electron by the time it took to get from the center to where ever it connected?

Or does it just wiggle around randomly through space?

Does the uncertainty principle apply only to electrons in orbit?

Thanks,
Eric
 
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No, but it does apply to your initial conditions. You cannot place the electron in the exact center of the sphere, exactly at rest.
 
Exactly like Bill said, the electron could never truly be placed within the centre of the sphere at rest.

On the behavior that the electron would be inhibiting, this is indeed a tricky question. Though if you were to put an electron inside of a total vacuum the electron would interact with the photons from the electromagnetic waves that exist within the vacuum.
 
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we expect the electron to collide with the sphere. So, it seems that the quantum and classics predict different behaviours!

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