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 measured using part of a mj3-iwk dug+xk b*8bv53 xi g-seasuring tape as scdm22qgxvf,x./rmk,8 qcl17 d nn.jy hown below, qf d2yrc1ldn8gmck2v7jn/x x.., qm.

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 readi.s3v7 e 3wt og*wig/rs+m; niong on a scale is usually taken as half the smallest division. Here the smallest division is 0.5 cm so we can read each iogon;e*s+vr mww /sgi .t733point 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.