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 paref,/ g dlcpb :6:9bucut of a metre rule that is grad) ski28ug )0nbudx1fg:t1ni buated in millimetres, as shown b0t u f)xsbig1)b1nnd8i2uk : gelow.

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 readinnt.: d4 ykt 7rqlet)b m7c x)azboq*8/ofe*3cg to ±0.5mm, following the 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 tot37 bdet8l. tzoc )/eqmfqcbk ox*4nr)7* :ya the same number of decimal places as the uncertainty.