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 measured using pa+.rwki*l--h c2 ruz lpm9jow/3xrr /jrt of a metre rule that is g-+ xk fh7uejv6:sa 0rnraduated sf+avn0hx j r:u 76-kein 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 take n9.ckxz-t ky 9myhv2 j+cv5v (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 have to add the absolute uncertainties, givk-.vyzyv x9t 9c(chk 2mvn5+jing 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.