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

[单选题]
Experimental data has :hliw7u,ig1p ma dua7u .-v3n)afw;6o/oc rn shown thbnu9 ix2rl,7*7 wa fvjat:
$$
P=\frac{g h^2}{u^3}
$$
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 powe* 8yos;5dgcm)j at m-+.ykuhe aw22rpr, the percentage uncertainty is the power multiplied by the percentage uncertaino;mc22hs gwa .tep j-)amk d 8uyr*+y5ty of the measurement. When measurements are multiplied or divided, the percentage uncertainties are added.