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

[单选题]
Experimental data has sho4 g raz:ibyss 0f3;o-own that:/srm.6fo/(r:-ug6d qnu ekth
$$
P=\frac{g h^2}{u^3}
$$
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 p+x 6y m- +o*)yohg y/,ibpyu3uj0cgv dower, the percentage uncertainty is the power multiplied by the percentage uncertainty of the measurement. When measurements are multiplied or divided, the perceyihym vj,x-u+y 3/doybogp0g) c+*6 untage uncertainties are added.