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 measureb8evh5(*+lk dzr7tqc d usingvw19 hxm+fzcyqxl05l g 2(8saeuz 49 d part of a metre rule that is graduated e94xll+ 10sxqdv zghf25ymz9 8uwca (in millimetres, 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 scale we can take each readingbzcm 4ao,z 6+q58ns 9c/hjpou- qnh6o to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we subtrao+ hp9,6 n/asu6c zb-ojno4qmch5zq 8ct 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.