Kognity IB Physics A.0 Measurements & Uncertainty (id: 420102d71)

admin

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 mexyx/ b8()byy / xzuejy+xzo11asured using pa :z7pmfn2y wmnk *dhhk+4*.jmrt of a metre rule that is graduated in millimetres, mh4 *pn:h z*7mm+2yn.kkd wjfas 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, following thec cd: b7emp:e7 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 presented to the same number of decimal places e77cd : b:pemcas the uncertainty.