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

[单选题]
Experimental data harfa;* yf -jv8ts srtjs ,nxi5x5y:q i j0.hown 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 r9q)e/a+l qrs oaised to a power, the percentage uncertainty is the power multiplied by the percentage uncertainty of the measurement. When measurements are multiplied or divided, the perceq roqsle+ /)9antage uncertainties are added.