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

[单选题]
The length of a penccei/ j 07lt/zp(y6sreil is measured using part of a metre rule 6 fsc4vr;,39esdp jjwd da+9lthat is graduated in millimetres, as shown below.pdr3sd 6w,v sjj4+al ce9d;f 9

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, followit 1itcl2m3t ohs44d+ -irx6jz ng the rule that the uncertainty is half the smallest division. So when we subtract o4 hzl3-12+t d rs4titcjxoi6mur 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 uncertainty.