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

[单选题]
The length of a pencil is measured using part of a metre65spi6dnn3, frg b l.l5glk/ 7mdutl6 rule that is fx/o*f*cf z;mgraduated in millimetres, as sz*fc;mf /* xfohown 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 tsn; gb pt/sk0)o ±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, g)b/ pksnt; 0sgiving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.