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 pencabi rh54- 0arof8ykv;il is measured using pas.ik.ou/) pn:m (f6 w:ao tolbrt of a measuring tape as shown below.nbpkm( lit6:os:/.wo.o u)f a

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 r 1q2etbx3 q6cxlhg*/1e v:ub cm scale! The uncertainty in a reading on a scale is usually taken as half the smallebu6 vtg:2b lcx1hq13 q*exr/ est 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 measurements - one for each end of the pencil. This means that we must also add the uncertainties, giving an uncertainty of 0.5cm.