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 penciljc*d ( fgd4hl a)aqe+jlf0,/k) ho)vy)4d f 4:cd b(hwg(bsxk is measured using part of a metre rule that is graduated in millimetres, as shown bechb4 4 d fxskw:)bgd((low.

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 c i /ztdaks raza4l.u)ctz/6y dz7:5r5 an take each 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. T)u td6c a.4 yraz/drs/5ia7kz l 5z:zthe length must be presented to the same number of decimal places as the uncertainty.