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 penci ,9mmo q-5fvlb/rg;yvpzq/3 r+nrbi 5be 0qd+hp-m*fl is measured using part of a measuring tape as shown below. 5 pbi+n-q+ *dr0efh mb 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 a925rc .yrk1w jfinyvmvr273 w t the cm scale! 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 measurements - one for each end of the pencil. This means that we 3ky2vvmrrcny.ji7 5f2 r9w1wmust also add the uncertainties, giving an uncertainty of 0.5cm.
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Post time 2024-8-21 21:38:19