What is delta V when given +-5 for example?


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aisteles1G
Posts: 117
Joined: Fri Sep 28, 2018 12:15 am

What is delta V when given +-5 for example?

Postby aisteles1G » Mon Nov 05, 2018 7:13 am

Is delta v just 5 or is it 10? In a hw problem the book just used the number given for +-5 so 5 but in the practice midterm we had to double the +- number to use as our delta v so I'm confused.
Thanks for any help!

005115864
Posts: 64
Joined: Fri Sep 28, 2018 12:15 am

Re: What is delta V when given +-5 for example?

Postby 005115864 » Mon Nov 05, 2018 7:33 am

Hi, this is the UNCERTAINTY given so yes you would have to go 10 and 5 for the uncertainty because you're given the uncertainty of velocity in order to find the most accurate position (delta x)

Think of it as a trade off, if you have the a certain momentum, then you must have an uncertain position, if you have a certain position, then you must have an uncertain momentum (tho often times the mass will always be certain, velocity isn't)



Hope this helped!

Katie_Duong_1D
Posts: 69
Joined: Fri Sep 28, 2018 12:27 am

Re: What is delta V when given +-5 for example?

Postby Katie_Duong_1D » Sun Nov 11, 2018 12:20 am

delta v would be 10 because that Is the entire spread of uncertainty in velocity. +- 5 means that the uncertainty in velvety is to a magnitude of 5 in both directions.

daniela3D
Posts: 19
Joined: Fri Sep 28, 2018 12:25 am

Re: What is delta V when given +-5 for example?

Postby daniela3D » Sun Nov 11, 2018 11:31 pm

When you see a number that has +- next to it you have to multiply by 2. Hence, 2(5) is the reasoning you acquire 10.


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