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 pencils woufsu7 2wq: fy.19q ydj 7//ikzv6 nis measured using part of a measuring tape as shown below7k/vy 6/ ndijz.

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 ,; bmx57lu0 v9jka l (4ls,wuamvwc9uscale! The uncertainty 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 measx5m, lmau( baskvwclv0wlj97u4; ,9u urements - one for each end of the pencil. This means that we must also add the uncertainties, giving an uncertainty of 0.5cm.