本题目来源于试卷: Scientific Skills & Tools，类别为 IB物理学
[单选题]
In finding the area of a circular metal plate, a student measures the radius $R$ of the plate and calculates the area to be $A\pm a$ ,where a is the absolute uncertainty on the area. Which of the following would give the fractional uncertainty on $R$?
A. $\sqrt{\frac{a}{A}}$
B. $\frac{a}{2A}$
C. $\frac{a}{2πA}$
D. $\sqrt{\frac{a}{2}}$
参考答案: B
本题详细解析:
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