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 measured using par9)lwq p+ /g7omox;j zyvzv+ z4t of ja;i2sjms (4ka metre rule that is graduated in millimetres, as showi 4 j;as(2jsmkn 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 reading iiw2*(youhrk sk88 wk- 5av+x 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 abx*r w 8 hk 8-k2svi5aiy(wku+osolute uncertainties, giving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.