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 j/av+ -twbc8ah(* mgw part of a metre rule that is graduated gbm/ cwt wj(-h8*va +a9do f lz2a5,s1vc3tg cu/ t6mbin milli ,/d3 6vot s59tcgclu fa12m zbmetres, 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 sca0o1bn-cr tay*t;9x fqle we can take each reading to ±0.5mm, 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 0.10cm. The length must be p1 -*aotry0ct9nfx;b q resented to the same number of decimal places as the uncertainty.
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Post time 2024-8-21 21:38:19