d) Uncertainty graphs
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How is the absolute uncertainty of a measurement shown on a graph?
An error bar
How is an error bar drawn?
Along the x- or y-axis
Starting from the minimum uncertainty to the maximum uncertainty
How is the gradient of an uncertainty calculated?
Draw a line of best fit that passes as close to the points
Draw a line of worst fit which is the steepest or shallowest line that passes as close to the error bars
Rise/run
How to calculate the percentage uncertainty of the gradient?
(best gradient - worst gradient) / best gradient × 100
How to calculate the percentage uncertainty of the y-intercept?
(best y-intercept - worst y-intercept) / best y-intercept × 100
What is a percentage difference?
How close the measurement reading is to the true value as a percentage
How to calculate the percentage difference?
(measured value - true value) / true value × 100
Flashcards (193)