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

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

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[单选题]
A piece of string 9.5 hwa* dk81xcu 4k5 ix4jv1ee418gb .:cgic h kq± 0.2 cm long is m5;/b xa5 pn;w z,+wzwmi sjm x o.+3q,nzy5pzcut from a longer piece that is 12.6 ± 0.2 cm long. How long is the 5 ;py b.jo+imm+zzn wanw55pz;xz/qm, s , w3xremaining 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:
$y=a-b=12.6-9.5=3.1 \mathrm{~cm}$ $\Delta y=\Delta a+\Delta b=0.2+0.2=0.4 \mathrm{~cm}$