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 i;z .u* wbwcl3measured usef/ )5uqw g2bhing part of a metre rule that is graduated i)w/ b5f eqghu2n millimetres, 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 can take eaokzr,gi) kno8on1y1/xz 3kw* ch reading to ±0.5mm, following the rule that the uncertainty is half the 8 k3o/1 onxkriz ,nk*z y)w1ogsmallest 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.