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 using part of a metre rdyc:/y 24i- 9ywxwotjule that is *l ltet;zoo9ar n1l 2)graduated in millit91 zltr); nel2o o*almetres, 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 gc 9m/bw9a-2ffzm rq3to ±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 add the absolute uncertainties9wacmq9m-3/fr zb f g2, giving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.