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 measured using.m11m emmtp vj24s2mb.3lw- qqyh- diahv:. s part of a metre rule that is 9dv0+rsgfwnh3c4 g:a graduated in milln3v +4a9hwd 0gcfrg s:imetres, 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 y/lxu : e/zf2,crpd:nce94n6o vxe/x x:z1xhcan 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 gen2/u:c/ e:x f1pxhz6 vo,/r x4 yxcde:z9xne lt 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.