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 mea6 mzg62(kn25t jb .kqf.qvxresured using part of a metre rule h7+jo+k we9/3euwfh t that is graduated in millimetreu+hok /few37j 9eh+tw s, 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 c5f3fly2gyeh ;: ugpt*. eq c6 far+l*lan take each reading to ±0.5mm, following the rule that the uncertainty is half the smallest divisi 5e+g*cr qy ;* hf ll:ft3l6.u2fpygaeon. 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.