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de Broglie wavelength

An electron of energy E and linear momentum p could be defined by a matter wave whose wavelength and frequency are given by

where h is Planckâ€™s constant. The wavelength of a moving particle calculated above is called its de Broglie wavelength.

Heisenbergâ€™s uncertainty principle

It is not possible to measure, simultaneously, the position and the momentum of a particle with unlimited precision. If âˆ†x is the uncertainty in position and âˆ†p is uncertainty in momentum, then