« on: 22/05/2019 11:16:58 »
Quote from: Devans99
Both detectors accurately measure position of the particle. We know ..how long the particle took to travel that distance.It depends what you are measuring, and how.
If the detectors emit a flash of light when the particle passes through it, the energy for the flash must come from somewhere - and it probably comes from the kinetic energy of the particle.
If it is a low-mass particle (like an electron), hitting the detector may lose much of the energy of the particle, so the time it takes to pass between the detectors is not very indicative of the initial velocity.
Such techniques may work better with heavier particles (eg protons or mesons), which can give up more energy without affecting their kinetic energy so much.
But this all comes back to Heisenberg's uncertainty principle: Quantum uncertainty is not so significant when you are dealing with more massive objects; but it can totally dominate your results with very small objects.
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