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

admin

本题目来源于试卷: Kognity IB Physics A.0 Measurements & Uncertainty，类别为 IBDP Physics

[单选题]
The length of a pencil is measured using part bb6.l(h4xe41 g3zu x- ntoicl of a metre rule thx*b eiu8cc38m cg, 0sp/ awrs-zn)cr)at is graduated in millimetres, as showwi*c u/ps )8)cnbzs8 -racm0c xr, 3gen 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 tauam ot/9xv)wp - t2:eoke each reading to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we subtrac9w-m2/ :evuxatt)o p ot our 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.