A-LEVEL Physics: 1.2.1: Sources of Uncertainty (SaveMyExams)

Question 1

uncertainty:

Answer 1

estimate of the difference between a measurement reading & the true value

Question 2

2 types of errors:

Answer 2

random & systematic

Question 3

random errors:

Answer 3

errors that cause unpredictable fluctuations in an instrument’s readings. due to uncontrollable factors

Question 4

random errors Affect the ___ of the measurement taken

Answer 4

precision

Question 5

to reduce random error:

Answer 5

repeat measurements & calculate average

Question 6

systematic errors:

Answer 6

errors due to faulty equipment or method

Question 7

systematic errors affect the ___ of reading obtained

Answer 7

accuracy

Question 8

to reduce systematic errors: (2)

Answer 8

-recalibrate instruments

-ensure method is correct

Question 9

zero error:

Answer 9

type of systematic error. occurs when instrument gives a reading other than 0 when it shouldn’t

Question 10

precision:

Answer 10

how close measurements are to each other

Question 11

accuracy:

Answer 11

how close measurements are to the correct value

Question 12

measurements can be ___ but not ___

Answer 12

precise, accurate, viceversa

Question 13

repeatability:

Answer 13

original person can repeat the same experiment, using same method & equipment, obtaining same results

Question 14

reproducibility:

Answer 14

same experiment is repeated by another person, or by using different equipment, & same results are obtained

Question 15

resolution:

Answer 15

smallest change in reading of the measuring instrument