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 ofoyk0b3i 5f.r p6dr e0x a metre rozzm:i8hzv0fkr 76i o:6yg,m ule that is graduated in millimetres, as shown bgmm hi i:8z,ov rz7 6z6ko0yf:elow.

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 rs+b9von rd o7.eading to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we subtd nbo9ov +7sr.ract 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.