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 mea)x.6 hyfltxi 50mo 6exsured using part of a metre ruf3 jnn)hg36qr le that is graduated in millimetres, as shown below. 3)qh3fjrng 6n

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 theh g oj jh0gama5qojivo*:0.)* 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, giving 0.10cm. The length must be presented t:qihgm.oj* o 0 a ojvh5ja*)g0o the same number of decimal places as the uncertainty.