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 measureo n1(s5pz 6psud using part of 2779h8gk ,aoc hvbkexa metre rule that is graduated in millimetres, as9gek8k7bx2ho,h 7a cv 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 reading to ±0.5mmjdw-+p9yf-r8vs6qa t6 w lui 5e ;;uif, 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 0.10c-uev+wq-58ji t w6; ;r dpyusiaflf96 m. The length must be presented to the same number of decimal places as the uncertainty.