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 / a-j ;etc.kq.5kps dicj 0mx.is measured ug 7h;)xfykxy p*uo1mm;h o3q 4sing part of a metre rule that is graduated in millimetres, as shown below.h gqyo)1 ;xhf*pm;u xy3mo74k

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 read0rr ;h-ik: rla7uiw v;ing to ±0.5mm, following the rule thk0iir;r-v aur 7h;:lwat 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 as the uncertainty.