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

[单选题]
Experimental data has show usd 81u8l-wqvn thawe*r he w23h e;bg83lmt:
$$
P=\frac{g h^2}{u^3}
$$
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 rq4c6m9 u)tjv6g- hzaoaised to a power, the percentage uncertainty is the power multiplied by the percentage uncertaint6vmjq )guhc 9-4a6otzy of the measurement. When measurements are multiplied or divided, the percentage uncertainties are added.