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

[单选题]
The length of a pencil i-5v4zvtnpdd 48n o a3zs measu- zki:azd0 vcg4.fr-lred using part of a metre rule that is graduated in mild.f4 zvcl z-r ikga-0:limetres, 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 eacz+n-m rivg3azokc(;-w ibm9* h 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 haveb-i;9vro g amwi-3+zn kzmc*( to add the absolute uncertainties, giving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.