## H bar

$\Delta p \Delta x\geq \frac{h}{4\pi }$

Daniel Bowen 3I
Posts: 32
Joined: Fri Sep 28, 2018 12:24 am

### H bar

Does anyone know if h bar will be a given constant or if we will have to find its value mathematically in each problem

Alicia Gibbons 1B
Posts: 31
Joined: Fri Sep 28, 2018 12:17 am

### Re: H bar

What do you mean? H bar is a constant that equals h/2pi. I think it's written this way so it can theoretically be simplified using the values of delta p and delta x.

Chloe Qiao 4C
Posts: 65
Joined: Fri Sep 28, 2018 12:27 am

### Re: H bar

I do not think h bar will be given as a constant during the test, but the equation of delta x * delta p >=h/4pi will probably on the equation sheet. So don't worry about h bar(unless you really like to use it and if so just remember h bar equals to h/2pi).

Megan Gianna Uy 3L
Posts: 30
Joined: Fri Sep 28, 2018 12:26 am

### Re: H bar

He has the equation sheet posted on his website with all the equations he's giving us for the tests. In this case the equation on the sheet is (delta p)(delta x)>=h/(4pi), so you dont need to know the value of hbar since hbar =h/2pi.

Hannah Yates 1K
Posts: 59
Joined: Fri Sep 28, 2018 12:27 am

### Re: H bar

H bar will not be given, which just means you need to do one more step when using Heisenberg indeterminacy equation. But, h will definitely be given.

Dong Hyun Lee 4E
Posts: 68
Joined: Fri Sep 28, 2018 12:23 am

### Re: H bar

H bar just stands for h/2pi. He does have the equation given on the first page of the exams but I would memmorize the equation he has taught us in the class where (indeterminancy in momentum) times (indeterminancy in position) = h/(4pi). As this is just easier to memmorize and use. It is useful to know the concepts behind it but at least for me, when solving questions this format is just easier to use.