TOPIC ONE Flashcards
What is the multiple and symbol for Tera
10^12
T
What is the multiple and symbol for giga?
10^9
G
What is the multiple and symbol for Mega?
10^6
M
What is the multiple and symbol for kilo?
10^3
k
What is the multiple and symbol for centi?
10^-2
c
What is the multiple and symbol for milli?
10^-3
m
What is the multiple and symbol for micro?
10^-6
μ
What is the multiple and symbol for nano?
10^-9
n
What is the multiple and symbol for pico?
10^-12
p
What is the multiple and symbol for femto?
10^-15
f
What is the definition of resolution?
The smallest non-zero value that can be measured
What is the definition of uncertainty?
The precision of a measurement due to the instrument used
What is the definition of repeatability?
Being able to redo the experiment the same way and get the same results
What is the definition of reproducibility?
Other people being able to use other equipment or techniques and get the same results
What is the definition of accuracy?
The measurement closest to the true value
What is the definition of precision?
Consistent measurements
What is the definition of systematic error and examples?
One which follows a trend + results in readings that systematically differ from the true mean reading
I.e. calibration error, non-zero reading at the start, error in technique
What is the definition of random error and examples?
One which is always present in data due to readings that vary randomly, with no recognisable trend or bias
I.e. could be caused by a faulty instrument, human error, poor technique
What is absolute uncertainty?
The size of the range of values that the ‘true’ value lies
What is fractional uncertainty?
Dividing the uncertainty by the value of the data
What is percentage uncertainty?
Fractional uncertainty x 100
How do you find uncertainty in the gradient?
percentage uncertainty = l best gradient - worst gradient l × 100%
———————————————
l best gradient l
How do find uncertainty in the y intercept?
percentage uncertainty = l best y intercept - worst y intercept l × 100%
————————————————
l best y intercept l
How do you combine uncertainties when two values are +/- together?
Uncertainties are added
How do you combine uncertainties when a value is multiplied by a constant?
Uncertainties also multiply by constant
How do you combine uncertainties when you x or / two values?
Add the Percentage uncertainties
How do you combine uncertainties when the value is put to the power of n?
n x percentage uncertainty
How do you estimate order of magnitude?
Calculate value and only give 10^n as answer
