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Absolute & relative uncertainty

by faisal
Tags: absolute, relative, uncertainty
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faisal
#1
May15-05, 01:15 PM
P: 46
how do i find the absalute uncertainty for the following
82.5+/-5.2%
679800+/-0.19%
0.0079+/-8.1%
420+/-23%
calculate the relative uncertainty for the following
1. 2.75 0.06
2. 714 8
3. .0031 0.0008
4. 204000 5000
5. 1.78 x 10-3 6 x 10-5
my answers
1. 2%
2. 1.12%
3. 2.5%
4. 2.4%
5. 3.4%
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OlderDan
#2
May15-05, 05:25 PM
Sci Advisor
HW Helper
P: 3,033
Quote Quote by faisal
how do i find the absalute uncertainty for the following
82.5+/-5.2%
679800+/-0.19%
0.0079+/-8.1%
420+/-23%
calculate the relative uncertainty for the following
1. 2.75 0.06
2. 714 8
3. .0031 0.0008
4. 204000 5000
5. 1.78 x 10-3 6 x 10-5
my answers
1. 2%
2. 1.12%
3. 2.5%
4. 2.4%
5. 3.4%
I assume there is a between the numbers in the second set of 5. #3 is incorrect. For #1, I would think you might keep another decimal place or two as you did for the others.

Finding absolute uncertainty from % uncertainty is the reverse process that you used for finding % from absolute. What is 5.2% of 82.5?


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