Uncertainty in Position Format


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KMcFarland_2L
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Joined: Wed Sep 30, 2020 9:52 pm

Uncertainty in Position Format

Postby KMcFarland_2L » Mon Oct 12, 2020 2:38 pm

If the problem says the uncertainty in position was +/- a value, would we use the positive form of the value or the negative form of the value to find the uncertainty in momentum?

Samantha Pedersen 2K
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Re: Uncertainty in Position Format

Postby Samantha Pedersen 2K » Mon Oct 12, 2020 2:51 pm

We would actually use the sum of the absolute value of the positive and negative forms of the number. For example, if the problem says the uncertainty in position is +/- 5 meters, then you would plug in 10 meters for the uncertainty in position. This is because the position can be anywhere within 5 meters above the reference point and 5 meters below the reference point, so the uncertainty in position spans a range of 10 meters.

Kimiya Aframian IB
Posts: 120
Joined: Wed Sep 30, 2020 9:34 pm

Re: Uncertainty in Position Format

Postby Kimiya Aframian IB » Mon Oct 12, 2020 4:13 pm

KMcFarland_1E wrote:If the problem says the uncertainty in position was +/- a value, would we use the positive form of the value or the negative form of the value to find the uncertainty in momentum?

I think it would be the absolute value because if we are trying to find the room for error, it would be by a certain numerical value, not necessarily a positive number. What I mean is that the difference between 9 and 3 is 6 and the difference between 3 and 9 is still 6. Hope this hepls.


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