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

admin

本题目来源于试卷: Kognity IB Physics A.0 Measurements & Uncertainty，类别为 IBDP Physics

[单选题]
The length of a pencil 2k.p o4 b7u(cpqh cz8xis measured using part of a metre rule thaj 7rm59f* nwqet is graduated in7 mwnfjq9e r5* 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 sca,bb,pkqa o 5b23x *opzle we can take each reading to ±0.5mm, following the rule that the uncertainty is half the smallest division. So ok,p 3zb,5xb *2bo qapwhen 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.