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 pencgc+ fa 1ax7. ftu2ej6xil is measured usinmi-c wuh*npkzh;5 fqs;ky8l/ z 0.j*qg part of a metre rule that is graduated in millimetres, as shown bey0u- l*5jfiz */.k ;hznckmw 8qsq ph;low.

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 scra3vr).3eh yvbv sbne*61wy6 ale we can take each reading to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we s3yy s6hv6aev b r3r1v)*ebn. wubtract 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.