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 part of a8mr5 ohb ;id7i9a/0 dgcyqk,l y w+/lq m :g8uv ol ,*4y,kt2 oc7wwqi ro.aioq(etre rule that is graduated in millimetres, as sh(*8yowa vc4 :7iqkouo2.i r,g, owltqown 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 rupru:6y*u6p 3pd ggm e09j1ylile 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 as6j:uy d0pm1l6igp g *r9eyup3 the uncertainty.