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 a dq 8br.rv +uo ljjj45:pc d4ss8istance fv*u.8s 7 txtjfour times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this meastu*.8 7xvtfs jurement?
A. $37.8 \pm 0.2 \; cm$
B. $37.8 \pm 0.4 \; cm$
C. $38.0 \pm 0.2 \; cm$
D. $38.2 \pm 0.4 \; cm$
参考答案: C
本题详细解析:
The mean of the measurements is 38.0 cm. The extremes (37.8 cm and 38.2 cx/ x+p2h5 n 1z-2eq)mol o6lqvdmtq;a m) are both 0.2 cm away from the mean. So C is +d/hx xzllaoe5q; tqm -q p21)o62nm vthe correct answer.
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Post time 2024-8-21 21:38:19