## What's the right equation?

Joanne Kang 3I
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

### What's the right equation?

Is the right equation △p△m ≥(h/4π) or △p△m ≥(1/2)h???
Lavelle and the solutions manual say different things...

Tiffany Dong_4e
Posts: 51
Joined: Wed Sep 11, 2019 12:17 am

### Re: What's the right equation?

If you're referring to the Heisenberg Uncertainty Equation, it should be the first one.

christabellej 1F
Posts: 109
Joined: Sat Aug 17, 2019 12:17 am

### Re: What's the right equation?

Both are the same equation. This is because the h is actually h bar and stands for h/2pi. 1/2 (h bar) would then be the same as the first equation as it is h/4pi.

Ariel Davydov 1C
Posts: 110
Joined: Thu Jul 11, 2019 12:16 am
Been upvoted: 1 time

### Re: What's the right equation?

If I'm thinking of the same question you're referring to (1B.27), there is an error in the solutions manual that Lavelle noted in his "Solution Manual Errors 7th Edition" PDF on his website. In this question, the textbook utilized that equation (1/2 h) instead of the one taught in class. If you refer to his correction, this question makes a lot more sense. Hope this helps!

105311039
Posts: 107
Joined: Fri Aug 02, 2019 12:16 am

### Re: What's the right equation?

It should be the first equation!

lauraxie2e
Posts: 108
Joined: Fri Aug 09, 2019 12:17 am

### Re: What's the right equation?

the first one should be the equation for heisenburg's uncertainty principle

ValerieChavarin 4F
Posts: 99
Joined: Wed Sep 18, 2019 12:18 am

### Re: What's the right equation?

Hannah Romano 4D
Posts: 55
Joined: Sat Aug 24, 2019 12:18 am

### Re: What's the right equation?

it should be the first equation for simplicity purposes. the second equation is the same thing as long as the "h" there is supposed to be an "h bar".