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 w9tpjk5* ycb) m5,c8i xks0 1 bqt:inr measured using part of a measuring tape as shown below. 0k,bmrqixc1 5n:ist 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 cm scale! The uncertainty in a nfv hy +5itjmp tbkq2rb,,smu86luy*9m5 (x 5 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 th5(2rqnxu tmb m,h+b myy9u*8, sjpv56i5ltk fe 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