2.1 Absolute And Percentage Uncertainty Flashcards
1
Q
What is absolute uncertainty of a measurement ?
A
- shows how large the uncertainty actually is, has the same units as the quantity being measured.
2
Q
What is percentage uncertainty?
A
- the absolute uncertainty divided by the measured value expressed as a percentage
3
Q
What is the absolute uncertainty when taking single readings?
A
- the smallest division on the measuring instrument used
4
Q
What is our reaction time and absolute uncertainty value when using a stopwatch?
A
- 0.5 seconds
5
Q
How do you find the combined absolute uncertainties of multiple readings?
A
- add the absolute uncertainties together
6
Q
How do you calculate percentage uncertainty of a single value?
A
- (uncertainty/measured value) x100
7
Q
How do you find percentage uncertainty of multiple readings?
A
- write down readings in table
- record mean of readings
- find range of repeated readings
- halve the range to find absolute uncertainty
- divide uncertainty value by mean value and multiply by 100
8
Q
How do you find absolute uncertainty for repeated readings?
A
- half the range of repeated values
