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 bg3;v4t mn7e5+ gjd4 i srw8(vs6b ldemeasurbvrhnr5o 3 jg1 jqm:;:ed using part of a metre rule that is graduated in millimehovjrm r3q:1bg j5 n:;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 ±0.5ms/faf cyxl*43- w0i;2xuvd vrm, following the rule that the uncertainty is half the -ws i/ x3vvay;fu *0x2fdrcl 4smallest 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 number of decimal places as the uncertainty.

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