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 uc- *tp n,.k9 k.fxfbfdsing part of a metr/ z*v mjx6j7 */xvcb yoluju+4e rule that is graduated in mill* vo jv/4 xux/y cjubl6mj+*7zimetres, 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 sca8ypw) ,da( lbkt7nv1 ,ve ;vwqle we can take each reading to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we subtract our two readingsw87()vk ;p1l, nte,vwbd vq ay 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.