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 usin ety9bh/ z6s()a ntq+ hv(qfi7g part of a muov*)7. u pswleasuring tape as shown below.uslp7wo).*v u

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 uncertaintl1zl2 o enrp+6xn4tp2)uda vp275xgmy 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 point on the scale to an accuracy of 0.25 cm. To find the length of the pencil we must take two measuremep+)x4ld7 1pv lrum5 t2eoz6 2gpn nx2ants - one for each end of the pencil. This means that we must also add the uncertainties, giving an uncertainty of 0.5cm.