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

[单选题]
Experimental data has showegryn/6lm;2 mbfb ,dv jk)b1g6 57tu/xx*jxn n q, w+pf j)y/tyy,u6wn 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 a power, the percenta)jkvv82., vs *ebvrygge uncertainty is the power multiplied by the percentage uncertainty of the measurement.2v *s8by.kr) vg jev,v When measurements are multiplied or divided, the percentage uncertainties are added.