In the context of quantum mechanics one cannot measure the velocity of a particle by measuring its position at two quick instants of time and dividing by the time interval. That is, v=x2−x1t2−t1
does not hold as just after the first measurement the wavefunction of the particle "collapses".
So, experimentally how exactly do we measure the veolcity (or say momentum) of a particle?
One way that occurs to me is to measure the particle's de Broglie wavelength λ and use p=hλ
and v=pm
to determine the particle's velocity. Is this the way it is done? Is there any other way?
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