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 penci w02pyo0fl/ml l is measured us 6ncxtgsddit,de.fgz 8( 7p (0ing part of a metre rule that is graduated in millimetres, as shown be g,fts(t.p7nd( cx 6gd0zi 8edlow.  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, followinn+ rj+j cdcnzf o,+ 7mmes+f2)id p0s8g the rule that the uncertainty is half the smallest division. So when m8z++i0njfcdeodp+2)n smc +fs7,j r 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 number of decimal places as the uncertainty.
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Post time 2024-8-21 21:38:19