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

[单选题]
Experimental data hapzc7zq cj: gsct 6iq5xya zn9 :7s;0enr84z3fmwt3; s3:x9jwzoe hw5s shown 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 raise4x4 bj0 krekv6gw 6g3, *grgefd to a power, the percentage uncertainty is the power multiplied by the percentage uncertainty of the measurement. Whe4 kxe0w6j,6v*rgre3b f gggk4n measurements are multiplied or divided, the percentage uncertainties are added.