Inconsistencies in Delta Values

[Sameer Chowdhury 3C]

For the Heisenberg Indeterminacy Module, number 23 asks you to find the delta V given that the position is +/- 5. In order to get this question right you need to then make your delta X = 10. This contradicts what is said in the textbook. In 1B problem 27 you are similarly asked to find delta V given that position is 5 +/- 5. In order to get this problem right the delta X has to equal 5. If I see a question like this on the midterm which should I use as my delta value, given it is +/- y? Should the delta be y or 2y? I assume I need to use 2y given that matches up with the problem in the module and Dr. Lavelle made the module and presumably that problem but I'm not sure.

[Racquel Fox 2I]

I'm pretty sure that you generally do 2*y in order to get delta y because that is the same as (5+5 + 5-5). I'm not sure if the textbook is flawed, but I think unless there is a given value for delta y, you would multiply the number after the +/- by 2 in order to find it.

[SamanthaTolentino 3D]

If the uncertainty is given as a +/- we use the difference. For example, uncertainty 10 +/- 5 therefore the uncertainty we would use would be 10. However when the uncertainty is just given, diameter of an atom is " " then we would use that value. Hope this helps!

[Varsha Ravi 3E]

If the problem gives you +/- [a number, let's say it's 5], then the uncertainty would be twice that, or 10. I believe the answer to 1B.27 is an error in the textbook which shows up on the solution manual errors on the website.

[Audra Mcleod 3G]

Hello!
The answer to this problem is most definitely an error, as the uncertainty in velocity would be 10 m/s not 5. Mr. Lavelle corrected this in his "Solution Manuel Errors 7th Edition" on his website, and included the correct answer.