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 men39z el 1, eroxhyf+.uasured usin4lqq.pzg,3ga3i -mf,srzb - wg part of a metre rule that is graduated in millimetres, as sh.rms-w4,l q33z, fg ibazg -pqown 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 can27wymwql+p5 m take each reading to ±0.5mm, following the rule that the uncertainty is half the smallest division. +257w lqymmpw 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.