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

[单选题]
The length of a pencil is measured using part of a meti,qj+ :zws5dusof*5 y re bw , e/c-lyj4 xxq2kv(rule that is graduated in millimetres, as shown be b-c2q/,x j(vwkxl4eylow.

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 0f- yr3r1 qpm8v wyp 9cvp. eh)qw7vg8each 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 ph3v8r8 yqfyem 7w09pp1cvqgpv).w- r laces as the uncertainty.