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 k6oo b- (0vdy8 0xemgnis measurecd81th 49xdbc d using part of a metre rule that is graduated in mcc49b1tx d dh8illimetres, 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, following the rule t6cs c) h mhli7os x)3r:-qhf-qhat the uncertainty is half the smallest division. So when we subtract oucqf)3 smh-cshlxoq6i h)-7 :rr 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.