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

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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 meag:e1mu((y o(+zf l2pb-vkz 6 vu2jgavsured using part of a metre rule that is graduated u g21 +avv vjfm( 2g z(:(lzbuyk-6eoprmuwc +9g6cpdmfil, :+8)sr pin millimetres, as shown be gismc+p +r6 )r8c9:ldmpw,uflow.

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 rule tc;*8: hzfy.fl2 (ay vihj)kj geg7w6 mhat 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 presented to the same num7h kh6(eg2*cmgyf)vfzjw i l. 8aj;y:ber of decimal places as the uncertainty.