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 metrebkx fp 3a1w j 1 ma23m4v-l:gohy/3lyp rule that is graduafay7ub4f i+fpscy. (o 6fv2l2 ted in millimetres, as shown below.f bl.i2o46p2f sua+yffvy c(7

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 the ruleqb5rpa05xf /z to.ua4 that the uncertainty is half the smallest division. So when f .pxaq0 r55 zbtu/ao4we 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.