Kognity IB Physics A.0 Measurements & Uncertainty (id: 6e0fa02a8)

admin

本题目来源于试卷: Kognity IB Physics A.0 Measurements & Uncertainty，类别为 IBDP Physics

本题为动态变量类型，下面题目描述与解答中出现的数值不同于您在作答时遇到的数值！

[单选题]
A piece of string 9.5 ± 0.2k;)p 4 l /jm34+ 0neijxbsbtib cm long is cut hkeejvdb:jf/2 m4; byg45zg.from a longer piece that is 12.6 ± 0.2 cm long. How long is thdk:bj 42 /e jg;.vyhe4bzg5fm e remaining piece of string?

A. $3.1 \pm 0.2 \; cm$
B. $3.1 \pm 0.3 \; cm$
C. $3.1 \pm 0.4 \; cm$
D. $3.1 \pm 0.5 \; cm$


参考答案:  C


本题详细解析:
$y=a-b=12.6-9.5=3.1 \mathrm{~cm}$ $\Delta y=\Delta a+\Delta b=0.2+0.2=0.4 \mathrm{~cm}$