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 measx)4wpyw j++th1 c3cdd ured using part of a metre ): 2)s 4c l7bex;vdhfrltkm /grule that is graduated in millimetres, as shown below.ecvg7dl/ :)f;t 4lmxk r )bs2h

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 r/tqft*6nvmt tdp6804xmx 9fc ule that the uncertainty is half the smatx*pv8x0 6mmfnfd/q 6ctt 94tllest 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.