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 77kzdl v t+zdf.)4i lywv /n9j using part of iks;fx 2-a7tt a metre rule that is graduated in millimetr afsx2- ktt7i ;es, 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 reading to ±0.5mm;.kl lmbdvc0*fx z)u1 , following the rule that the uncertainty is half the smallest division. So when we subtract our two readings to get the length of the penxkbl;.0*1dm uvf )zclcil, 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.
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Post time 2024-8-21 21:38:19