Measurements and Errors Flashcards
1
Q
T
A
10^ 12
2
Q
G
A
10^ 9
3
Q
M
A
10^ 6
4
Q
k
A
10^ 3
5
Q
c
A
10^ 2
6
Q
m
A
10^ -3
7
Q
μ
A
10^ -6
8
Q
n
A
10^ -9
9
Q
p
A
10^ -12
10
Q
f
A
10^ -15
11
Q
eV to J
A
x 1.6 x 10 ^-19
12
Q
J to kWh
A
/ 3.6 x10^ 6
13
Q
define random error
A
Unpredictable errors from uncontrollable factors
14
Q
Define systematic error
A
faulty instruments or practice
includes zero error
15
Q
define precision
A
Measure of spread about the mean
16
Q
define accuracy
A
How close to TRUE VALUE
17
Q
percentage uncertainty =
A
absolute uncertainty / measured value x 100
18
Q
uncertainty of a reading
A
+- 1/2
19
Q
uncertainty of measurement
A
+- 1
20
Q
uncertainty of repeated data
A
+- 1/2 RANGE
21
Q
uncertainty of digital reading
A
+- last sig fig
22
Q
Adding uncertainty
A
Add ABSOLUTE
23
Q
X uncertainties
A
add PERCENTAGE uncertainties
24
Q
Raising to power uncertainties
A
MULTIPLY PERCENTAGE uncertainty by power
25
define error bars
Shows ABSOLUTE uncertainty of graph
26
percentage uncertainty from graph = (gradient)
best grad - worst grad / BEST grad x 100
27
percentage uncertainty from graph = (y intercept)
best y - worst y / BEST y x 100
