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 m (ax;(woq,yhmb 0 u w)8sg+lfueasured using part of a measuring tape as shown -c/qhkb lyngyw5howu,1;l a l), j30 ibelow ,w hql-u,;n w 5cyykijl/al )h31go0b.  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 thebg:w .kf0/ssk afj( f s7x7x7o,f s(re 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 aek/gs os07 ffb jx77 ws,sxk.r(ff:(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.
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Post time 2024-8-21 21:38:19