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 penc*;aa 5pdl:tecilq: tfh07 9 gsno8*mbs0rzh6th is measured using part of a metre rule that is graduated inb9of6 gm:hqts r n h8s*0t70zh 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 reading tl lygt8(1p a.6gwue: co ±0.5mm, following the rule that the uncertainty is half the smallest diviu18:t c wp gae(y.ll6gsion. So when we subtract our two readings to get the length 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.