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 andfk0 janr( 6,elvw5e.h b, are measured ( :2gb .c(*i-dizh-awoljn td 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. They 3mb,g1)v pzdz )i(wfpcannot both be the smallest, so they must both be incorrect. A and B will have the sam3 fz 1bmpzi )gdv)(,wpe 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.
| 
Post time 2024-8-21 21:38:19