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

[单选题]
The length of a pencil is measured using pa 6aum.ys:rsu34slmv45x ;w bqrt of ,8ayy7 +gfk5uur(6w ida6 km+.0urncb+nve pa metre rule that is graduated in millimetres, as (0niby8w g+k rdnyp+uf m6c5v6 u+k7aae r .u,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 cauv-mrem1;t0 df mofcxek7 )(pu z4h+, n take each reading to ±0.5mm, 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 present-mt(7u, k4cuzhme01moex)fd+ pvfr ; ed to the same number of decimal places as the uncertainty.