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

[单选题]
The length of a penciljz y p+/ts-w4r is measured usin5r1wm. mq) sbog part of a metre rule that is graduated o.q51)mmrsw bin millimetres, 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 take each reading to ±0 *xry 7of(vzv: 3gu, /rpf9 1yf0usahw.5mm, following the rule that the uncertainty is half the smallest division. So when we subtract our two0 ffy :(axhvr/uyps,*1ufgzr wo 9v3 7 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.