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 pea+a+e2m ue kkaij* vd(p-r:9 fqa:(aart of a metre rule 5 9 kxz:eiv4utthat is graduated in millimetres, as tkxi 4zu e5v:9shown 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 ±0.5 -psuzkk4y u xi;h w7(2v0z)t 9fo9lnlmm, following the rule that the uncertainty is half the smallsy-f ;i l9w4 (0u2 z)txp9k7kvhzlunoest 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 as the uncertainty.