本题目来源于试卷: Kognity IB Physics A.0 Measurements & Uncertainty，类别为 IBDP Physics
[单选题]
The time for two events, a and b, are 0-0 pv6alu7hgh )gib ameasured t5ck1.ecvwi)t gii ni5/ z2/v*h 9slfko 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 frac4dgtt5*om a)vf , g)pctional uncertainties. They cannot both be the smallest, so they must both be incorrect. A and B will have the same absolute uoc5d ap ),4ft*m) vggtncertainty (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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Post time 2024-8-21 21:38:19