Kognity IB Physics A.0 Measurements & Uncertainty (id: d206553aa)

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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, are02 kgvvp 8u:+m 5uhuk6h 8vi) ubndkj8 measuredubj ew4frq; -/bwq .9)8czf,iqg ,awg 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 ia r6c7zh3 -fz u 0fjhb.8k-rfy7yxeq,dentical fractional uncertainties. They cannot both be the smallest, so they must both be incorrect. j ze8xr0-au-f r3 h kc,q fz7byy6.7hfA 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.