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

[单选题]
The length of a pencil is measured using p0- o2/jshlf:- gvemuafiv t+,art of a metre rule that is graduatedo;crzudtm66/ in millimetres 6ou;d/6rztmc , as 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 takei4fkszcx 28 cl 6a/bk, 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 presented to the same number of decimal places as the uncertk ca6sz,/xic8fl4bk 2ainty.