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

admin

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 mexp-mnuj- nu3s :;wac0khr3cj3 edt08 asured using part of a measuring tape as shown behfg lyb+-snv ;vg)q yaj2( 3cj5-ut x:low.l5(x ugb; ja3fvg+vth)cy -:-2j ns qy

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 uncertainty in a readil1e yaj vg2oku7x30ct)svs 77ng 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 meay 2eos3vs kx7vcj )u0tlg 717asurements - one for each end of the pencil. This means that we must also add the uncertainties, giving an uncertainty of 0.5cm.