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

[单选题]
The length of a pencil is m6pbznr6 r9l+geasured8h-bqxll u2ty.r.en 5 using part of a metre rule that is graduated in millimetres, as shown below.. h.-lxtl258y enburq

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 ±0.5mm3ccg:6 ,09wc u iadytg, following the rule that the uncertainty is half the smallest division. c:t g ag0u,iwycdc639So 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 uncertainty.