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 usinj/2a5iyvv)(v y:cbcyx ai 4-fg part qf y7ysj:w70xof a metre rule that is graduated in millimetres, as shown belowswj 7:yqy0 x7f.

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 to ±0.5mm, following the rul8qvykzg,s/3 mbd ,(kz9o5 wor e that the uncertainty is half the smallest division. So when we subtract our two readings to get the length of the pencil, we9b,o3 8/okkwdm,5 qg y(vzzsr have to add the absolute uncertainties, giving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.