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 usifz6 h pc22fahhdccx/ 6pxb:0 7ng pvuejh5fj0c5f.j f )m12 9xw fvart of a metre rule that is graduated in millimetree fj1 ffju9v05jwv.5fm )h 2xcs, 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 scal0v,wq0 vn(2b9r e whuwe we can take each reading to ±0.5mm, following the rule that the uncertainty is half th2br0w0wwqn vvh 9,u(ee 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 presented to the same number of decimal places as the uncertainty.