Kognity IB Physics A.0 Measurements & Uncertainty (id: 3fa7c8121)

admin

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

[单选题]
Experimental data has shmr,0pgyy ;:dqb vn (f0hcyk i;ol.o6,);y 2lu /.zl kz-mksnc own that:
$$
P=\frac{g h^2}{u^3}
$$
where $g$ is a constant. If the percentage uncertainties in $h$ and $u$ are $a$ and $b$ respectively, what is the percentage uncertainty in $P ?$

A. $2a + 3b$
B. $2a - 3b$
C. $(2a/3b)$
D. $a^2/b^3$


参考答案:  A


本题详细解析:
When measurements are raised to c7/o qwbvo2p0i05ytmc*4:a vljjo w( a power, the percentage uncertainty is the power multiplied by the percentage uncertainty of the measurement. When measurements are multiplied ocj/4yvq5oo o7c*ji( :vwam2l 0 tpw 0br divided, the percentage uncertainties are added.