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 pencdii,ojgn. i koqw-5*2 c(*0suqahe)qcy w fm6)a:o 5ril is measured using part of a metre rule that is graduated in millimetr(qcawrc ) oq )f*uae0h6:5symes, 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, follow dm9e7pk hv3 *2k(pvqm9oaf4sing the rule that the uncertainty is half the smallest division. So when we subtract our two readings tam ko 9v(h7pe9vfkd*qm s432 po 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.