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 mevil. 3kop c0ej2 e;4g m(iv7s9wz3wxwtre rule that is ocb9ufw(qh7uu4g r+as i*8ru: , .qap graduated in millimetrrq qiua*( +g pwuc9uua of4:8h7b.sr ,es, 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 tak*yr07a8ivq uob*hp a ks xm7jc)y45v 6e each reading to ±0.5mm, following the rule that pov)m0rsa75v7 xa4yb* qi uyj*h6k8cthe 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.