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 i 2cijx2yxb4 n9,sxk4is measured bccx3 /-/bazaqw*cm 3 using part of a metre rule that is graduated in millimebwm3 / 3xa/qaccz*c- btres, 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 each reading to ±0.5mm, following tx5/zkc n,8vjo6z:l/ ae6f y nwhe rule that the uncertainty is half the smallest division. So jywf :l8/6 vz6zckxo/,en5n awhen 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.