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

[单选题]
Experimental data has showlm;9r mz:swz wk))t+ljk3+h zoiizsgt1l5w;u+6wu6zg w)j 3 1m: ifon 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 raised to a power, the percentage gqyhnw j6q5e8 ,hg8)jgsm8 f2uncertainty is the power multiplied by the percentage uncertainty of the measurement. When measurements are mqnh2ys gwf8 jm,ejhq )858 g6gultiplied or divided, the percentage uncertainties are added.