![]() That is, the more exactly the position is determined, the less known the momentum, and vice versa. ![]() The principle states that it is impossible to know simultaneously the exact position and momentum of a particle. “If the uncertainty in the position of a particle at a particular time is Δx and uncertainty in momentum is Δp, then their product will be equal to or greater than Planck’s constant.” ![]() It is called the Heisenberg’s uncertainty principle. Again, as the measurement of momentum is more accurate the measurement of the position will be less accurate. That means, as the measurement of the position of a particle becomes more accurate, there will be more error in the measurement of momentum. According to his opinion, simultaneous determination of positions and momentum of a particle accurately is impossible. So, scientist Heisenberg put forward the concept of uncertainty in the simultaneous determination of position and momentum. This is because that wave spreads all around. But when matter behaves as a wave, then its position and momentum cannot be determined accurately. When matter behaves as a particle, then according to classical mechanics its positions and momentum can be determined accurately. According to De-Broglie hypothesis matter has dual characteristics – one is particle property and the other one is the wave property.
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