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 an h/f 70kcs,g(9aixef h )ab9ah:seucho10p u9d b, arh,9vo/ 9vidad e 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 have identical fractional uncertabbms ;;1 :krjsinties. They 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 (10ssb;;rk j1mb: ) compared to B (0.2). Hence fractional uncertainty of A is the smallest.
| 
Post time 2024-8-21 21:38:19