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 ofxgwd9/(kpyr 6 a metre rule th ek.qw*2sg1rifrf - 1(gd t5ceat is graduated in millimetres, as s seg 1erit(-2*1. fwcdfgrqk5hown 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, folledo/ 5 a3 -3idvouzn(aowing the rule that the uncertainty is he5(dndz3ouia-oa 3 v/alf 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.