Question

HEY MATES!!!

QUESTION FOR U ~＠^_^＠~

EXPLAIN THE HEISENBERG'$ UNCERTAINTY PRINCIPLE.... ☢☢


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Answer 1

The Heisenberg uncertainty principle is a rule in quantum mechanics.  It states that there is a fundamental limit to how well you can simultaneously know the position and momentum (where momentum is classically mass times velocity) of a particle.  This means if you know the position very precisely, you can only have limited information about its momentum and vice-versa.

Furthermore this is a mathematical inequality that does not depend on measurement technique or how you find the position and momentum.  In fact, it has recently been shown experimentally that even if you have an instrument that is so precise that it should (theoretically) be capable of measuring the position and momentum of the particle below the Heisenberg uncertainty limit, the spread in measured values leads to an uncertainty that is still above this limit.

EDIT: There seems to be some confusion so I dug up the experiment I was thinking of.  Here is a fairly understandable Nature News article on it: Quantum uncertainty not all in the measurement.  Basically the measurement does not necessarily cause the uncertainty.  

Answer 2

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• Uncertainty principle •

In quantum mechanics, the uncertainty principle (also known as Heisenberg's uncertainty principle) is any of a variety of mathematical inequalities asserting a fundamental limit to the precision with which certain pairs of physical properties of a particle, known as complementary variables, such as position x and momen
tum p, can be known.

Introduced first in 1927, by the German physicist Werner Heisenberg, it states that the more precisely the position of some particle is determined, the less precisely its momentum can be known, and vice versa.The formal inequality relating the standard deviation of position σx and the standard deviation of momentum σp was derived by Earle Hesse Kennard later that year and by Hermann Wey in 1928:

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