### Heisengberg Uncertainty Equation Meaning

Posted:

**Thu Oct 17, 2019 2:50 pm**What does Heisenberg Uncertainty Equation measure and when would you use it?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=19&t=47813

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Posted: **Thu Oct 17, 2019 2:50 pm**

What does Heisenberg Uncertainty Equation measure and when would you use it?

Posted: **Thu Oct 17, 2019 3:12 pm**

The equation means that there is uncertainty in the momentum and position of a particle, so it basically measures this uncertainty. The questions will probably ask things like "What is the minimum uncertainty in its position?" or "What is the minimum uncertainty in the speed?"

Posted: **Thu Oct 17, 2019 3:21 pm**

The Heisenberg uncertainty principle states that if the location of a particle is known with an uncertainty (delta X), then the momentum of the particle (p) can be also known within the uncertainty of delta p. The equation is usually used to find the minimum uncertainty in the speed (delta v) or the position (delta X).

Posted: **Sat Oct 19, 2019 12:16 pm**

In the Heisenberg equation, what number would you plug in for delta X? and what does X stand for?

Posted: **Sat Oct 19, 2019 3:06 pm**

505316964 wrote:In the Heisenberg equation, what number would you plug in for delta X? and what does X stand for?

The delta X would be the space that the electron is confined in, so its position could be anywhere within that space. For example, in problem 1B25, it gives us the info where the diameter of the lead atom is 350 pm. Delta X would be that 350 pm bc the electron's position is somewhere within that diameter.

Posted: **Sun Oct 20, 2019 12:59 pm**

Basically, on a very small scale, the path that is taken by an electron is not exactly certain therefore the velocity and momentum aren't 100% accurate either. The Heisenberg Indeterminacy Equation is used to account for this limit on how accurate the velocity and momentum can be.

Posted: **Sun Oct 20, 2019 2:13 pm**

Conceptually, the Heisenberg uncertainty equation demonstrates the relationship between knowledge of a particle's velocity and its position. When we accurately measure the position, it becomes more difficult to pinpoint the general trend of its path, and when we understand its path, it is hard to know where it will be at any given moment.

Posted: **Sun Oct 20, 2019 3:30 pm**

Are there any textbook practice problems that you guys would recommend in particular for these concepts?