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 measured xql1nnhp eci2o0 6xfl) u/s8 5using part of a metre rule that is graduated.:0 99vah :fwvmoqu 1 n2resmaa)swa5 in millime.o:v:sqaseu aa w5mrw0)ah fm92n9 v1 tres, as 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 each reading to ±0.5mm, followiw3bk ynn( 3hc k/.a6:,irkfsbng the rule that the uncertainty is half the smallest division. So when we subt :.bbyw/,kn 36( kcksifhar3nract 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 number of decimal places as the uncertainty.