Kognity IB Physics A.0 Measurements & Uncertainty (id: 294aaa607)

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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 paso2lwqcq:i 6y7gg43 urt of a measuring ts:8w 0wp2sl djbskb( qzl2i:9ape as shown belowlsbqs 8w(i0 z:kls9 pd2w:2jb.

What is the length of the pencil?

A. $4.5 \pm 0.1 \; cm$
B. $11.5 \pm 0.2 \; cm$
C. $11.5 \pm 0.3 \; cm$
D. $11.5 \pm 0.5 \; cm$


参考答案:  D


本题详细解析:
We should be looking at the cm scale! The uncertaik-wk+ ldohmktpk9( f3o3 rj-0kaeo-)nty in a reading on a scale is usually taken as half the smallest division. Here the smallest division is 0.5 cm so we can read each poi)rk3- f0 (keh3 t-9+ -akkldjokopom wnt on the scale to an accuracy of 0.25 cm. To find the length of the pencil we must take two measurements - one for each end of the pencil. This means that we must also add the uncertainties, giving an uncertainty of 0.5cm.