Quiz 1 Fall 2015 #3  [ENDORSED]


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Chin_Alyssa_3I
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Quiz 1 Fall 2015 #3

Postby Chin_Alyssa_3I » Tue Oct 11, 2016 10:17 am

Find the uncertainty in the position of a marble of bass 1.5 g given that its speed is known to within plus or minus .55 m/s

My question is whether the uncertainty in velocity is .55 or is it the difference...(.55 - -.55 = 1.10)?

Katelyn Li 2J
Posts: 27
Joined: Wed Sep 21, 2016 3:00 pm

Re: Quiz 1 Fall 2015 #3  [ENDORSED]

Postby Katelyn Li 2J » Tue Oct 11, 2016 10:44 am

I think in this case it should be 1.10 because that's the whole range of the potential speed.

For example, some object with a speed of 9 m/s and an uncertainty of plus or minus 1 m/s means it could be 8 m/s or 10 m/s. Therefore, the uncertainty would be 2 m/s.

Minh_Le_3I
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Re: Quiz 1 Fall 2015 #3

Postby Minh_Le_3I » Thu Oct 13, 2016 7:20 pm

Are we suppose to double the speed if its +/- to cover the entire range in all Heisenberg uncertainty problems then?

Ara Yazaryan 1E
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Joined: Wed Sep 21, 2016 2:59 pm

Re: Quiz 1 Fall 2015 #3

Postby Ara Yazaryan 1E » Thu Oct 13, 2016 7:24 pm

Minh_Le_3I wrote:Are we suppose to double the speed if its +/- to cover the entire range in all Heisenberg uncertainty problems then?


Correct me if I am wrong, but on the Heisenberg problem in the practice quiz we turn in we do not double it because we want the minimum error and adding that uncertainty would rather give the maximum error.

If someone can elaborate please do.


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