## Heisenberg Uncertainty Principle Post-Module Assessment

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

Ben 1B
Posts: 55
Joined: Sat Aug 17, 2019 12:16 am

### Heisenberg Uncertainty Principle Post-Module Assessment

What are the necessary steps and formulas to answer question number 18 from the Heisenberg Uncertainty Principle Post-Module Assessment?
18. The hydrogen atom has a radius of approximately 0.05 nm. Assume that we know the position of an electron to an accuracy of 1 % of the hydrogen radius, calculate the uncertainty in the speed of the electron using the Heisenberg uncertainty principle.

Chem_Mod
Posts: 18400
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

### Re: Heisenberg Uncertainty Principle Post-Module Assessment

Use heisenberg's uncertainty principle deltap * deltax >/= h/4pi, where delta p = m * delta v. Find delta x using the given information: you have the radius of H and know that delta x is 1% of radius of H. Plug this into the equation along with mass of the electron and Planck's constant and solve for delta v, the uncertainty in speed.

Ruth Glauber 1C
Posts: 100
Joined: Wed Sep 18, 2019 12:20 am

### Re: Heisenberg Uncertainty Principle Post-Module Assessment

Why is there a difference in calling it the uncertainty vs undeterminability principle?