Question

why do we need Heisenberg uncertainty principle

Answer 1

Hey bud,here's ur ans...

The Heisenberg Uncertainty Principle (HUP) is not just a side result of quantum mechanics. In fact, it is arguably the most important fundamental concept behind all of quantum mechanics. Put another way, the speed of light being constant in every reference frame is to special relativity just as the HUP is to quantum mechanics. Because of this, the HUP has played a SIGNIFICANT role in any scientific theory or technology that follows from quantum mechanics. For example, classical electrodynamics very effectively models light as a wave that can oscillate in different ways. A wave that is oscillating up and down is said to be "vertically polarized." Take two light sources that emit vertically polarized light in sync (that is, the "up" and "down" movements of the light are matched). Now rotate one of these sources 45 degrees clockwise and the other one 45 degrees counter-clockwise and position them so that the two resulting "in phase" DIAGONAL waves form an "X" as they travel away from you. It turns out these two waves will interact with each other to produce vertically polarized light yet again. In other words, the "left to right" and "right to left" motion of the two waves will cancel each other out and the remaining motion will be purely "up and down." Because of this, ALL VERTICALLY POLARIZED LIGHT spreads 50% of its power along clockwise polarizations and 50% of its power along counter-clockwise polarizations.

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Answer 2

the Heisenberg uncertainly principle is a law in quantum mechanics that limits how accurately you can measure two related variables... Heisenberg explained this using something called the observer effect which says that the very act of measuring one value affects the other and therefore introduces some certainly.