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 measured using part of a metre rule +jq8n) mjbai /t9., uhwo3d (7l8s rms;nmnd bthat is graduated imw,h3d db smluos;89tn(n .r7n 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 taetyxs:f*ia,.t7 i+2ap, n c lyke each reading to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we subtract our two7e nxali 2*,fyyip ct :.sa+t, 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.