Kognity IB Physics A.0 Measurements & Uncertainty (id: 420102d71)

[单选题]
The length of a pencil i,hxvs1d0h1ub/e)j-bah v ul+ s measured using part of a metre rule that is grad9 kq3 is -yw6v8n/mse8l.n7hzfkwr0 luated in millimk6s h 08 ww-qmvln/8zl.n7 fe3ykir9setres, 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, folb+hi+ be 8krxrv9sb 2z1o zm5+lowing 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 absolut+x5sz bk+zob98+ievrm2 rhb 1e uncertainties, giving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.