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 is q+ke8 f(ugwz2 7g f/c0hcxoca1ru3/ fmeasured ujnk,2ym 1 :mj;l1j 9.m1m ld8ebi;dpog2bhl qsing part of a metre rule that is graduated in millimetres, asm;,9 qp nil mj lkjm:h21.2 8jb1bd dy1elog;m 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 eavba6l,rm 7 pdfyb. 6:tch 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 presentedmb.a6dyfpv:b6, trl7 to the same number of decimal places as the uncertainty.