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 med 86)xt28pctz qatrr9jh7t e c8x+1) eunbz8qf8z x7masured using part of a metre rule that is graduated in milliftq8h7)z8 nez+7cejb x1u8x mmetres, 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 ek2bq,zhy ah,d+ri-h+ ach reading to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we subtract our t- hbr+da yi h,2+,zqkhwo 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.