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 using part of a metre rule that ro xtttr; 497 r;*twdibm* -bkis 321nc vl nv5-h3tikf mgraduated in millimetresfn lm2n- iv3 t3c1hk5v, 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 ±0.5mm, foll2 jo y5yrks/yn4sdbw*pt ,h bw** +g5yowing the rule that th*bn4*,wg+ s5toh/ y*spy2b5 k yrdjywe 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 presented to the same number of decimal places as the uncertainty.