## Heisenberg Indeterminacy Post Assessment #20

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

Julia Lindner 1I
Posts: 35
Joined: Fri Sep 28, 2018 12:17 am

### Heisenberg Indeterminacy Post Assessment #20

"Use the above uncertainty in velocity to calculate the electron's uncertainty in kinetic energy. Then calculate the uncertainty in kinetic energy per mole of electrons (that is, per mole of hydrogen atoms). Comment on your value."

How do you find uncertainty in kinetic energy? As far as I know this was not mentioned in either the lectures or the textbook.

Blake Salfer 1B
Posts: 30
Joined: Fri Sep 28, 2018 12:18 am

### Re: Heisenberg Indeterminacy Post Assessment #20

all you have to do is plug in the velocity found in the problem above into the equation Ek=1/2mv^2 and you will get the uncertainty in KE

Grace Kim 1J
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Joined: Fri Sep 28, 2018 12:18 am
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### Re: Heisenberg Indeterminacy Post Assessment #20

You use the answer of the velocity you found in problem #19. Then you want to use the kinetic energy formula. Make sure you convert the answer you get to energy per mol of electrons (multiply the answer with 6.022x10^23e/mol). When are you asked to find the uncertainty in kinetic energy, just remember the formula (Ek=1/2mv^2).