Topic 1: working as a physicist Flashcards
Define accurate
A measure of how close a measured/calculate by repeated measurements
Define concordant
Concordat/precision is a measure of the consistency of values obtained by repeated measurements
Define parallax error
the error that occurs due to incorrect positioning of the eyes while taking a reading on a measuring scale.
give an example of a systematic error
an error of ten
What is a random error
shifts all your measurements by random amounts
What is a systematic error
error that shifts values by the same amount e.g a factor of ten
What is uncertainty
How do you calculate absolute uncertainty of a value of a range of values
half of the range
How do you calculate absolute uncertainty of a value
Half the resolution
How do calculate % uncertainty
absolute uncertainty/measurement x 100
What happens when you add % uncertainty
you add the uncertainties
How do u calculate percentage difference
accepted value-measure value /accepted value x100
What happens when you divide a % uncertainty
you add the uncertainties
What happens when you subtract % uncertainty
you add the uncertainties
What happens when you times % uncertainty
you add the uncertainties
What happens when you raise a %uncertainty to a power
Multiply the uncertainty by the power
What is an si unit
a standard international unit
What are the 7 si units and their base units
LACTTLM
mass kilograms
length meters
current Amps
amount of substance moles
temp kelvin
time sec
light candella
How can you improve precision
Repeat measurement and find outliers
Using a smaller scale division
using higher resolution equipment
How can you improve accuracy
Repeat measurements and find the mean
using a better method
using better techniques
How do you find the percentage Uncertainty of the gradient of a graph
Lobf-wolobf/lobf x100
what is wolbof
worst line of best fit
What is labof
line of best fit
What is LACTTLM
LIGHT
AMOUNT OF SUBSTANCE
CURRENT
TIME
TEMP
LENGTH
MASS
