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Kognity IB Physics A.0 Measurements & Uncertainty (id: 42defc112)

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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]
The time for two events, a an6l+/ xhm je)l) ma4fxkx9 2tizd b, l77e zsw8;epo0;k/s;o w1df hq: iwte are measured to be (5.1±0.1)s and (4.9±0.1)s respectively. In which of the following quantities is the fractional(percent) uncertainty the smallest?

A. a+b
B. ab
C. a×b
D. a/b


参考答案:  A


本题详细解析:
C and D will both have identical fractional uncertainties. They cdb*3c99ocswymk q gz9x)57f nannot both be the smallest, so they must both be incorrz79y9mwfs b*q c k g5)3odx9cnect. A and B will have the same absolute uncertainty (0.2 s), but A is a large number (10) compared to B (0.2). Hence fractional uncertainty of A is the smallest.

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