Kognity IB Physics A.0 Measurements & Uncertainty (id: 420102d71)

[单选题]
The length of a pencil is measured using part of wgk5o ud8ck ,os(6 wyi:1/sk(q)gqf la mmk7 zzfzh-5.oetre rule that is graduated in millimetremozz f-kz.75hs, as shown below.

What is the length of the pencil?

A. $(6.00 \pm 0.10) \; cm$
B. $(6 \pm 0.1) \; cm$
C. $(6 \pm 0.05) \; cm$
D. $(6.00 \pm 0.05) \; cm$


参考答案:  A


本题详细解析:
With a millimetre scale we can take each readinl 3c:z9vcmyn ty,3rpt q ;e,;og to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we subtract t;oypct;,rq 9en,z c3v3:lm your two readings to get the length of the pencil, we have to add the absolute uncertainties, giving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.