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 pencipbzyo*m( (8t bl is (ksqikd)e0qln9 a 7w4measured using part of a metre rule that is graduated in millimetres, as shown bel)dkq(e q7k a 94isnw0low.

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 reaw 4x5yek4*f-c law+oy maqq*+ding to ±0.5mm, following the rule 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 addw45 eq amk+l*4oqx c*-yfy w+a the absolute uncertainties, giving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.