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

[单选题]
Experimental data has 9noqhf* 1gpvdd 3 a/m1shown1tof:x 2ywz 0t 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 29/cp :v )8ex,vox vufqb8krvraised to a power, the percentage uncertainty is the power multiplied by the percentage uncertainty of the measurement. When measurements are multiplied or dv2 8qrc)pb:fuok ,xxev /vv8 9ivided, the percentage uncertainties are added.