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 uvz9aj 4n/lwwb6ie8tl d2sl.e 96pn)v 7g;ndttyrz1v 8 so,a7 sing part of a metre rule that is graduated in mill8d,oytv nza7 1;7 tsgrimetres, 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 each reading to ±0.5mm, followi7 nl gdhvf;bv9mk +v:q1f-e(ong 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 add the absolute uncertainties, giving 0.10cm. The length must be pbkoh7:;mv d-nlfv( gf+qv91eresented to the same number of decimal places as the uncertainty.