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 is meaikoy 7s .+zryz1)y2 rq us/x.rsured using z-43.tjf rucxgf 4f.rvcm b 83part of a metre rule that is graduated in millimet8v3 z-x4 crfmuf 3g b.f.tjc4rres, 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 ta ewkv/ a0oj7 4omh g+adz3z2+hke each reading to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we subtract our two readings to get thg aho/32 d+wjzo0a4kzh7+emv e 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.