## HW Question 1.B.27

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

605379296
Posts: 58
Joined: Sat Aug 17, 2019 12:16 am

### HW Question 1.B.27

So for this problem I got the answer to be 8.28*10^-36 m but the answer key replaces h with 1.054*10^-34. Is this a mistake or am I just doing the problem wrong?

William Chan 1D
Posts: 102
Joined: Sat Sep 14, 2019 12:15 am

### Re: HW Question 1.B.27

It's not h, it's h bar, or ℏ, which is equal to h/2π, or about 1.054457 x 10^34

Megan Vu 1J
Posts: 101
Joined: Thu Jul 25, 2019 12:15 am

### Re: HW Question 1.B.27

In the lecture, we used Heisenberg's Indeterminacy Equation as (indeterminacy in momentum)(indeterminacy in position) >/= h/4pi.
However, in the book, they use the equation with the use of the h bar, which is ℏ equaling to h/2pi as 1.05457 x 10^-34 J*s.
They both are the same because in the book, 1/2hbar = 1/2(h/2pi) = h/4 pi. This is equal to h/4pi in the class.