h-bar [ENDORSED]

[Jade Corpus-Sapida 1G]

In the Heisenberg uncertainty equation, does h-bar basically mean plancks constant divided by 2pi? Will this number always be the same/constant or are there instances where its different?

[Chem_Mod]

h bar is always

[Jacob Samuels 1E]

Will we need to memorize the value of h-bar on the test next week?

[Caroline Crotty 1D]

Since on Test #1 we are given many formulas we did not need for that test specifically, I think we can assume h bar will not be specifically given. The formula sheet does include the value of Planck's constant and pi so you can easily use that information and your knowledge of h bar to find the value needed.

[EllenRenskoff-1C]

If h-bar is h/ 2*pi, where does the h/ 4*pi come from in the Heisenberg Indeterminancy Function come from?

[Josian1A]

I was also confused between the practicality of using instead of . What is the difference between the two?

[Chem_Mod]

h-bar is used because it is a common value for use with the Schroedinger equation. is a derived quantity in the Heisenberg equation, but it is not represented with a special character because it does not show up as commonly in quantum mechanical equations compared to h-bar.

[Emma Leshan 1B]

The Uncertainty Equation stated in the textbook has 1/2 * h-bar, and since h-bar is h/2pi, we use h/4pi.