Measurement

Question 1

Systematic errors

Answer 1

Occur because the instrument is in some way inaccurate

Question 2

Random errors

Answer 2

Occur due to limitations of the measuring device

Question 3

Accuracy

Answer 3

How close the measurement is to the correct value

Question 4

Precision

Answer 4

Hw close the measurements are to each other

Smallest measurable unit on the measuring device

Question 5

Uncertainty occurs…

Answer 5

Due to limitations of the measuring device (its precision)

Question 6

Percent uncertainty

Answer 6

Ratio of uncertainty to the measured value multiplied by 100%

uncertainty/value x 100%

Question 7

Percent error

Answer 7

Ratio of the difference between the accepted and measured values and the accepted value multiplied by 100%

(measured-accepted)/accepted x 100%

Question 8

Rules for Sig Figs

Answer 8

1. All non zero digits
2. Imbedded zeros
3. Zeros trailing in a decimal
4. Exact numbers are infinite

Question 9

Rules for calculating

Answer 9

1. Adding/subtracting: to the decimal place of the number with the fewer decimal places)
2. Multiplying/dividing: same sig figs as the smallest umber of sig figs
3. Combined: multiplication/division rule