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Kognity IB Physics A.0 Measurements & Uncertainty (id: e02fa186f)

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admin 发表于 2024-9-4 22:23:27 | 显示全部楼层 |阅读模式
本题目来源于试卷: Kognity IB Physics A.0 Measurements & Uncertainty,类别为 IB物理学

[单选题]
A student measures two lengths as follov:xkw d+7mp gwcke8(k+:k 9clw *4py :ndrj.w :p6gimts: a=(10±0.1)cm b=(20±0.1)cm
Which of the following quantities has the largest percentage uncertainty?

A. a
B. b
C. a+b
D. ab


参考答案:  D


本题详细解析:
The largest percentage uncertainty will result from the largest absoq uaz,lc/ ar956lwou0lute uncertainty divided by the smallest measurement value. A and B have an absolute uncertainty of 0.1 cm, while for C & D it is 0.2 cm. So the percentage uncertainties are: A 1%; B 0.5%; C 0.67%; and D 2%. Clear6w0 o rzc5 9,u/alqlualy D is the largest.

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