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 metre rule that is g8/v zyf ;4n -v*hwckfxraduatedp) gov 9dkb (9gw-do,j in millimetres, as shown belowgobodk wpgv-( j d9)9,.

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 /z 2l(jb oml 1n*t*/ 8lwmlccfrule 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 lemc / zbl8o2w/lmll*ct(f 1jn* ngth must be presented to the same number of decimal places as the uncertainty.