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 penci urwncuj65)/is*t bazxtu; 6,l is measured using part of a metre rule that is graduated in t;b6z u,s t*ax 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 takeov)y)ml7+ jwl38 plxw each reading to ±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 hw 8l y 7ljxp+w3vo)lm)ave to add the absolute uncertainties, giving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.
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Post time 2024-8-21 21:38:19