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 measur*xtdnb xf o:7,ed using part of arj;1 ahqma )1 qwg,v,5 n1gwvttih t8/ metre rule that is graduated in millimetres, as s m;vavw,,rai5h81jtq1 w1) tnh tgqg/hown 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, following the rule3ald n1p.k (ogt 6rkb,rd( z8u 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 presented to the same number of decimal places ap nrkd81uak3d6 ,.rbz( t o(lgs the uncertainty.