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 meas 9blvyw o0.9lsm)o0qq ured using part of a measuring tape as ruv (wmx pb176shown below ux(bwm7 p1 v6r.  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 :.b8upjfx(9e u0bbqku+ 9 ppcthe cm scale! The uncertainty in a reading on a scale is usually taken as half the smallest division. Here the smallest di . (pu+p09bufp9qbujxbe:ck8vision 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.
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Post time 2024-8-21 21:38:19