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

[单选题]
The length of a penci/vdy5 1ppes;j l is mea vg ihrb 3yod+s*gvzmva07l, 32+4ghusured using part of a metre rule that is graduated in millivh 2*digz40vv b+s 3gyrgu, hmla3o+7 metres, 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 reabu7 u 9(rzgic)4*m8lmsg hdk ;ding to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we subtrac98*74z )b(umudhcgg mrkls i;t 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.