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, 2lk f)v eht h.i9:jas/a and b, 6ev r(ip7-g7iwsutn9 are measured to be $(5.1 \pm 0.1)s$ and $(4.9 \pm 0.1)s$ respectively. In which of the following quantities is the fractional(percent) uncertainty the smallest?
A. $a+b$
B. $a-b$
C. $a \times b$
D. $a/b$
参考答案: A
本题详细解析:
C and D will both havkt,46 ndu24e lblt2v 7mz 3vlae identical fractional uncertainties. They cannot both be the smallest, so they mustv 2nk2z altdlml4364,be7 utv both be incorrect. 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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