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-d(kr-.r unj:w o /rfford:ke:e4 9s+ ecze7 o distance four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best ese9+:7o osc:e4 deezrktimate of this measurement?
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 cm) are +qu3,rng: c xrboth 0.2 cm away from the mean. So qrx,r3 c+ :nguC is the correct answer.
| 
Post time 2024-8-21 21:38:19