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 pencildol g-.n-0 hd7l kyl2h is measured6* 3ojq8r p2sy: idccb using part of a metre rule that is graduated in millimetres, as sh6r yb8s:i*j3qcpc2od own 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 the ruleu)d3hk.2ncb9*ty/ 5y gtcg fa that the uncertainty is half the smallest division. So wn g3c/ *bg khtu.d2c9tyy5f)a hen 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.