Uncertainty & significant figures. Feb 7, 2013. Accuracy & precision. All measurements have some amount of uncertainties, also called “errors”. The uncertainty is generally one half of the smallest scale division. The uncertainty is the measure of the precision of an instrument.
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Feb 7, 2013
11s - The time is accurate to the nearest second.
What about 11.0s & 10.97s?
Add the measurements:
Subtract the 1st measurement from the 2nd one
Multiplying & dividing …..
Keep the least significant figures!
32.5 x 1.2 =
Eg1. The thickness of a book is 2.1 cm. The total thickness of 3 books is:
3 x 2.1=6.3 cm
Eg2. A student measured a basketball court of WSC. Its length is 28.65 m and width is 23 m
Its area is:
28.65 x 23 = 658.95 sq. m
its area is 660 sq. m (least s. f.)
Q1. Given that a = 20.23 0.05 m, b = 12.02 0.05 m
a. find a+b
b. complete the sentence:
The sum of a and b is between _________ and __________.
Add relative uncertainties.
=0.002 (1 s.f.)
=0.004 (1 s.f.)