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 penci s nfh,sw)05lull6lb(c5vpdz(fc 9x:l isfmqgeyok xw94+6 0wuxmx6yg*2);fmag xp( y( measured using part of a metre rule that is graduated 6p9y4g kmwgxe)xy02au+*6w g ;x om ymq(fx(fin millimetres, 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 1ffvut.od e9)wv n;e,mh2 x2y to ±0.5mm, following the rule that the 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 w.)oe2u xty9vfme 1;hf ,d vn2presented to the same number of decimal places as the uncertainty.