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 o99 c:tu4 xsmq is measur ccksi 5q-*b ;led using part of a measuring tape as shown below. *ib;qcsl -c 5k 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 ) wooq 5evgl0 msw6e)6b )e(plen,o d1reading 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 must also add the uncertainties, giving ang6dlm)esb n,w)1w)e vl6o( 0o5 eopqe uncertainty of 0.5cm.
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Post time 2024-8-21 21:38:19