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 pencilirs : 4 lz7e)xe;-cbyj cfr ggk.:a+t.) 3bmbj is measured using part of a metre rule that is graduated in millimetres, as shown belowa:f. g)mr bbktjc3+g..

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.:2q gl9xj drhlk/qyeu *8y(;l5mm, following the rule that the uncertainty is half the smallest division. So when we subtract our two reall l ;ekyuj (:*/92g8qyrd xqhdings 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.