Uncertainty principle | Definition & Equation | Britannica
ウェブ2024年3月29日 · Uncertainty principle, statement that the position and the velocity of an object cannot both be measured exactly, at the same time, even in theory. The very concepts of exact position and exact velocity together have no meaning in nature. Werner Heisenberg first stated the principle in 1927.
Uncertainty principle - Wikipedia
ウェブThe uncertainty principle, also known as Heisenberg's indeterminacy principle, is a fundamental concept in quantum mechanics. It states that there is a limit to the precision with which certain pairs of physical properties, such as position and momentum, can be simultaneously known.
The Uncertainty Principle - Stanford Encyclopedia of Philosophy
ウェブ2001年10月8日 · According to quantum mechanics, the more precisely the position (momentum) of a particle is given, the less precisely can one say what its momentum (position) is. This is (a simplistic and preliminary formulation of) the quantum mechanical uncertainty principle for position and momentum.
7.3: The Heisenberg Uncertainty Principle - Physics LibreTexts
ウェブ2022年9月12日 · Heisenberg’s uncertainty principle is a key principle in quantum mechanics. Very roughly, it states that if we know everything about where a particle is located (the uncertainty of position is small), we know nothing about its momentum (the uncertainty of momentum is large), and vice versa.
What Is the Uncertainty Principle? Heisenberg Uncertainty Principle ...
ウェブFormulated by the German physicist and Nobel laureate Werner Heisenberg in 1927, the uncertainty principle states that we cannot know both the position and speed of a particle, such as a photon or electron, with perfect accuracy; the more we nail down the particle's position, the less we know about its speed and vice versa.
Understanding the Heisenberg Uncertainty Principle - ThoughtCo
ウェブ2018年1月31日 · Heisenberg's uncertainty principle is one of the cornerstones of quantum physics, but it is often not deeply understood by those who have not carefully studied it. While it does, as the name suggests, define a certain level of uncertainty at the most fundamental levels of nature itself, that uncertainty manifests in a very …
29.7: Probability and The Heisenberg Uncertainty Principle
ウェブ2022年2月20日 · Heisenberg’s uncertainty principle a fundamental limit to the precision with which pairs of quantities (momentum and position, and energy and time) can be measured uncertainty in energy lack of precision or lack of knowledge of precise results in measurements of energy uncertainty in time
Heisenberg's Uncertainty Principle - Chemistry LibreTexts
ウェブ2023年1月30日 · The Heisenberg Uncertainty Principle is a fundamental theory in quantum mechanics that defines why a scientist cannot measure multiple quantum variables simultaneously. Until the dawn of quantum mechanics, it was held as a fact that all variables of an object could be known to exact precision simultaneously for a …
THE UNCERTAINTY PRINCIPLE - Stanford University
ウェブTHE UNCERTAINTY PRINCIPLE SHINTARO FUSHIDA-HARDY 1. Heisenberg uncertainty principle Suppose p: R !R is a probability density function for a random variable X. The moments of Xare given by (1) m n:= E(Xn) = Z R xnp(x)dx: (Assuming they exist), the rst moment m nis the mean of X, while m 2 m2 1 is the variance of X.
Uncertainty principle - HyperPhysics
ウェブThe uncertainty principle contains implications about the energy that would be required to contain a particle within a given volume. The energy required to contain particles comes from the fundamental forces, and in particular the electromagnetic force provides the attraction necessary to contain electrons within the atom, and the strong ...
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