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 usinea( w4j*y( l9i8o21z kjwtfa hg part of a metre rule thahqpa q8t-q: sqkya/./5( gezwt is graduated in millimetres, astqzga-h:5y8k e.apq s/q /wq( 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 readi7z b)aia sx*o5ng 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. The length must be presesoa* iba7 x5)znted to the same number of decimal places as the uncertainty.