Kognity IB Physics A.0 Measurements & Uncertainty (id: 420102d71)

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本题目来源于试卷: Kognity IB Physics A.0 Measurements & Uncertainty，类别为 IBDP Physics

[单选题]
The length of a pencil jd m2ojm)lm 6:is measured using part ofs ca9*)9kgib rkt tnfi :+a*d2 a metre rule that is graduated *agk9):c9it*f 2asibtkrd+ n in millimetres, as shown below.

What is the length of the pencil?

A. $(6.00 \pm 0.10) \; cm$
B. $(6 \pm 0.1) \; cm$
C. $(6 \pm 0.05) \; cm$
D. $(6.00 \pm 0.05) \; cm$


参考答案:  A


本题详细解析:
With a millimetre scale we can take each k 7qo ;0llprr.*aca9m v ilp15reading to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we subtract our two readings to get the lengtilpk0m.rc7 9vaq5pl ;aor 1*lh of the pencil, we have to add the absolute uncertainties, giving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.