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 measuring tape as sho cd4dm86 t.i h, d+;m w8panywgw rn/q8 oe z,8xkn below 8qerxknz/o 8,.  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 cf/e+pt-pf8 cf6q:njp 3;kvxj m scale! The uncertainty in a reading on a scale is usually taken as half the smallest division. Here the smapf+kj cq/;- n: 36tep 8vjpfxfllest 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.
| 
Post time 2024-8-21 21:38:19