Kognity IB Physics A.0 Measurements & Uncertainty (id: 294aaa607)

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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 measured using part of a measuring 5cnyac r69 g/v,d* 7+ujrugletape as shown bel 8c(hqx9zsb o9owcszh8 q(9o b9x.

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 reading on a s fuscxc4q 295 4fxoef6cale 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 -ec5f4 cq6s4 x2u xof9f one for each end of the pencil. This means that we must also add the uncertainties, giving an uncertainty of 0.5cm.