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 hu3e:5mr+iqjjw q mv*2e 6 bp*q 6(fqkis m1 66xrux i6swkp;*toqeasured using part of a metre rule that is graduated 1t 6qprx x w6;kso*6iuin millimetres, 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 ±0.50qm -no3 5j -yz6a9lbok zs*qumm, 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 uncertainties, giving 0.10cm. zu5naq9zbso 0m-3kjl *oy - q6The length must be presented to the same number of decimal places as the uncertainty.