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

[单选题]
The length of a pencil is measbr 0kwwm 9 -f5viyq3t9gl7qatz0.k5uured usingn; w(e u xnrj3(7cx8ev part of a metre rule that is graduated in millimetres, ase ( vwxunec 8rxn3;j7( 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 reading to ±0.5mm, following thel6 b-j acr7n95lt khs0 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 uncerl thcl 7b0 ar9-56nsjktainties, giving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.