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 penci we2xfc00a9baq)j:b1g lu sq9l is meas 2qv1zzfchei.:7 vqu. ured using part of a metre rule that is graduated in millimetres, as sho .2czzeuq iv:1 vfh7q.wn 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 readtu)dt8jr t95w yg:c c)/*b+p9 nxbyyemrei*;ing to ±0.5mm, following the rule that the uncertainri))t+5rj* pmt nytdcx 9by*ube9 /y:cge; w8ty 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.