uncertainty principle

In quantum physics, the outcome of even an ideal measurement of a system is not deterministic, but instead is characterized by a probability distribution, and the larger the associated standard deviation is, the more "uncertain" we might say that that characteristic is for the system. The Heisenberg uncertainty principle, or HUP, gives a lower bound on the product of the standard deviations of position and momentum for a system, implying that it is impossible to have a particle that has an arbitrarily well-defined position and momentum simultaneously. More precisely, the product of the standard deviations , where is the reduced Planck constant. The principle generalizes to many other pairs of quantities besides position and momentum (for example, angular momentum about two different axes), and can be derived directly from the axioms of quantum mechanics.
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Noun
1. (quantum theory) the theory that it is impossible to measure both energy and time (or position and momentum) completely accurately at the same time
(synonym) indeterminacy principle
(hypernym) scientific theory
(classification) quantum theory

Heisenberg's uncertainty principle; Heisenberg principle.The exact momentum and exact location of a particle cannot be specified. Werner Heisenberg stated that the product of uncertainties in location and momentum measurements can never be smaller than h/4 , where h is Planck's constant .

Eng: uncertainty principle
Urdu: اصُولِ لا تیقن ۔ {طِبیعیات} قَدری میکانیات سے مُتعَلّق اصُول جو ایک معین وَقت پَر ایک سے زیادہ قابِلِ مُشاہِدہ مِقدار کی تَجَرباتی صحَت و دَرُستی کے نامُمکنات کو بیان کَرتا ہے ۔