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

[单选题]
Experimental data has e+ fpz,.tt69or3 glbfshown 0aoa i(r2a7oozp4-(wk2:zuw j8 pko nthat:
$$
P=\frac{g h^2}{u^3}
$$
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 16zy0f ,vgiy3pbj,ojg7h k0r, the percentage uncertainty is the power multiplied by the percentage uncertainty of the measurement. pok7fgyj0j0rvbz,3 6,1g ih yWhen measurements are multiplied or divided, the percentage uncertainties are added.