hello there!
i hope my answer will help you
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i think you meant by ‘PRINCIPLE OF UNCERTAINTY’
SO, HERE IT IS!
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TO KEEP IT SIMPLE :-
Uncertainty principle, also called Heisenberg uncertainty principle or indeterminacy principle, statement, articulated by the German physicist Werner Heisenberg, that the position and the velocity of an object cannot both be measured exactly, at the same time, even in theory.