Units for Heisenberg Indeterminacy Equation


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David Chibukhchian 2G
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Units for Heisenberg Indeterminacy Equation

Postby David Chibukhchian 2G » Mon Oct 26, 2020 9:48 am

Hey guys, I had a question regarding the units for the Heisenberg Indeterminacy Equation. I know for the De Broglie Equation, we have to make sure mass and velocity are in kg and meters/second (respectively). However, I wanted to make sure that this was also the case for the Heisenberg Principle. Sometimes the units confuse me a bit, so I just wanted to make sure that you always have to use kg and m/s for this formula as well.

Benjamin Chen 1H
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Re: Units for Heisenberg Indeterminacy Equation

Postby Benjamin Chen 1H » Mon Oct 26, 2020 9:53 am

Yes, you're correct.

kilogram x meter/sec x meter = Joule x sec

sophie esherick 3H
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Re: Units for Heisenberg Indeterminacy Equation

Postby sophie esherick 3H » Mon Oct 26, 2020 9:53 am

For Heisenbergs Indeterminacy principle, I'm pretty sure the units are the same as for the De Broglie equation. So you would use the mass in kg and the velocity in m/s.

Anna Yakura 2F
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Re: Units for Heisenberg Indeterminacy Equation

Postby Anna Yakura 2F » Mon Oct 26, 2020 9:54 am

As a general rule of thumb you should use SI units (so kg and m/s). A lot of the times you're asked to find the indeterminancy of velocity or position of an electron -- so you would use the mass listed on the equation sheet (9.11 X 10^-31 kg).

SamayaJoshi1A
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Re: Units for Heisenberg Indeterminacy Equation

Postby SamayaJoshi1A » Mon Oct 26, 2020 10:18 am

Yes- for me it is generally easier to look at the units and convert them to meters per second and SI units before I begin the problem. Something that always catches me is the meters per hour- make sure it is in seconds!

Inderpal Singh 2L
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Re: Units for Heisenberg Indeterminacy Equation

Postby Inderpal Singh 2L » Mon Oct 26, 2020 11:04 am

Yes, I believe they are the same thing. Use kg for mass and m/s for velocity. Make sure to convert if not! :)

David Chibukhchian 2G
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Re: Units for Heisenberg Indeterminacy Equation

Postby David Chibukhchian 2G » Mon Oct 26, 2020 11:07 am

That definitely makes sense! I always miss the per hour thing too haha. But now I'll definitely make sure that the units are always kg and m/s when doing problems with Heisenberg's Principle. Thank you guys!


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