Kognity IB Physics A.0 Measurements & Uncertainty (id: 5755219dc)

[单选题]
If A=10.0 and B=0.50, ( b+7ftbtskzx-t+nvj.(i fg ,which calculation will 6xwq9 :.stb1a ; ki/ jjfg;va4z(mb7:td g rkggive the answer with the most decimal plac:jbzkbgftakgvx j 6dm; 9:s.17 ; giq(ar 4w/tes?

A. $A \times B$
B. $A/B$
C. $A^2$
D. $B^2$


参考答案:  D


本题详细解析:
$A$ is given to 3 significant figures and $B$ is given to 2 significant figures. Hence all calculations using $B$ will have answers with 2 significant figures. Calculations with just $A$ will have 3 significant figures Therefore, $A \times B=5.0, \frac{A}{B}=20$, $A^2=100$ and $B^2=0.25$, so with 2 decimal places, D is the correct choice.