本题目来源于试卷: Kognity IB Physics A.0 Measurements & Uncertainty，类别为 IBDP Physics
[单选题]
A student measures twooz.4pon4622xdk,eau 0hvml( kg/nk t lengths as followst j(4ey ) pbn*j(;xeqd: $$a = (10 \pm 0.1) \; cm$$ $$b = (20 \pm 0.1) \; cm$$
Which of the following quantities has the largest percentage uncertainty?
A. $a$
B. $b$
C. $a+b$
D. $a-b$
参考答案: D
本题详细解析:
The largest percentage uncertaintycui2vi-5g bu 87qk. uf16dhj2u nr/ ou will result from the largest absolute uncertainty divided by the smallest measurement value. A and B have an absolute unce gr.cdkj7iq/25 u1u 8vn62if ho ub-uurtainty of 0.1 cm, while for C & D it is 0.2 cm. So the percentage uncertainties are: A 1%; B 0.5%; C 0.67%; and D 2%. Clearly D is the largest.
| 
Post time 2024-8-21 21:38:19