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 3r2 -zug;kb)sz s5h 5qquuq+g rule that is graduat psrek ++6n a 4q:eupbto5j-w2ed in millimetres, as utn6: jq 5-4r+e+kappb o s2ewshown 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 to ±0.5mm, following kv*i q35zg(2dvuxf-lthe rule that the unce3f-udq(x2vv li z5g* krtainty is half the smallest division. 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.
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Post time 2024-8-21 21:38:19