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

[单选题]
The length of a pencih+e qnj +g(ip.i.u)4r. gxvc w hp:n,il is measured using part of a metry bh/yin:8o i( (fspq-kb(fa3 e rule that is graduated in millimetres, as show-of qfy(3:pb8 anki(bhs/ (iyn 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 reading to ±0lx3hk :aje 1b h4dwja415h:gm.5mm, following the rule that the uncertainty is half the smallest division. So when we subtract 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 paj4 x 5h:dea1ghhb3 lj1:k4 mwlaces as the uncertainty.