IB Physics Topic 1 - Measurements and Uncertainties Prep Exam And Correct Answers.

IB Physics Topic 1 - Measurements and
Uncertainties Prep Exam And Correct
Answers.
Rules for the number of significant figures - Answer - non-zeros are always significant

- zeros in between non-zeros are significant

- zeros that occur to the left of a non-zero are not significant

- zeros that are to the right of the decimal point are significant

-when there isn't a decimal point, trailing zeros are not significant



orders of magnitude - Answer a number that has been rounded to the nearest power of 10



fundamental units - Answer -length (m)

-mass (kg)

-time (s)

-electric current (A)

-thermodynamic temperature (K)

-amount of a substance (mol)

-luminous intensity (cd)



derived units - Answer units that are not fundamental



estimation - Answer a usable approximation of a true value, more precise than orders of magnitude



systematic errors - Answer the system causes a random set of measurements to be spread about a
value rather than being spread about the accepted value



what do systematic errors result from? - Answer -badly made instruments