## Questions about Heisenberg

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705160853
Posts: 30
Joined: Fri Sep 28, 2018 12:18 am

### Questions about Heisenberg

For the uncertainty questions, if it says 23 +/- 0.1 m/s, would delta v be 0.1 or 0.2?

I thought it was 0.1 but I was never sure about this

A De Castro 14B 2H
Posts: 75
Joined: Fri Sep 28, 2018 12:29 am

### Re: Questions about Heisenberg

Delta v would be 0.2 because 23 +/- 0.1 indicates that possible values lie within 22.9 and 23.1
Since 23.1 - 22.9 = 0.2, delta v is 0.2

705160853
Posts: 30
Joined: Fri Sep 28, 2018 12:18 am

### Re: Questions about Heisenberg

are you sure because for hw question 1B.27 it says +/- 5.0 and in the solution manual it uses 5.0

A De Castro 14B 2H
Posts: 75
Joined: Fri Sep 28, 2018 12:29 am

### Re: Questions about Heisenberg

Yes, I'm sure. Check this out too if you're still uncertain: viewtopic.php?f=19&t=34622&p=113448

Jonas Talandis
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

### Re: Questions about Heisenberg

The Solutions Manual for 1.45 is incorrect. This is listed on Prof. Lavelle's list of Solution Manual errors. You can find the link into a post of mine from tonight. The value for delta v would be 0.2.

Vicky Lu 1L
Posts: 60
Joined: Fri Sep 28, 2018 12:18 am

### Re: Questions about Heisenberg

For uncertainty questions, delta v depends on the part after the ±. So in the case of your example, 23 ± 0.1 m/s, just multiple the uncertainty part (± 0.1 m/s) by two as the possible values is up and down at 22.9 m/s and 23.1 m/s.