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 and b, 9. iomu42xvms are meau; w jjqm4;j*tsured 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 have identical fractional uncertainties. Thomi;au +pxk(7g y 8n0aey cannot both be the smallest, so they must both be incorrect. A and B will have the same absolute uncertainty (0.2 s), but A is a large number (10) comx8+o0a;ap( 7n miuykg pared to B (0.2). Hence fractional uncertainty of A is the smallest.
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