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 usinhb l 0 w8 ms+b 9ddfepd(1;w)qgl:qi3ag part of7d6k/p dqjxq1 a metre rule that is graduated in millimed/p6q 7xqkd j1tres, 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 eab.jdfo)ta mv17f 22uyhhk rhy5 +3k1bch reading to ±0.5mm, following the rule that the uncertainty is half the smallest division. So when we subtract our two readings to gej2 rb.t7kay2vymhuh+1 5f3) 1hkbdf o t 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.