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 usi s0f b:xa)d08qdqdr,i ng part of a measurin 0ylut6g 3/e qeg tape as shown below. /36t0 ye lgueq 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 reading ohtaa0mpyp5 6 l:ay2t 3qzvt+) n a scale is usually taken as half the smallest division. Here the smallest division is 0.5 cm tpa m0q5l3ta2v+ a6)p : yzythso 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.
| 
Post time 2024-8-21 21:38:19