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 meft vj0).y6i6y gfk t,iasured using part of a metre rule that i w5f 4b jlual(:)rut(mx5 sr2hs graduated in milft(us)4(blhu5r2x5 j lw mar:limetres, 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 the ru tza1yk- )8 yqhf*)xuqle 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 fh)uy 8xq* t)qzyka1-same number of decimal places as the uncertainty.