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 ocfnp20a.x: f vgvr-m(k z dx0(f a metre rule that 7- lx amc/kdut ) -jxxac)bl;5is graduated in millimetres, as s))- c/d;kx-j lba7xx l5cuamthown 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 eacylahq1(: b y1lh reading to ±0.5mm, following the rule that the uncertainty 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:1bqhy y1 l(la to the same number of decimal places as the uncertainty.