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

[单选题]
The length of a pencil is measured using paroz,2 wk8xngg2u is5h5o/kw ,rt of ax-tc)lk h2y*km d)-vevk d 0h6 metre rule that is graduated in millime x-kde lh)vyvkh)d-kct *6m2 0tres, 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, followipu86n l fw 6ezct6zv79ng the rule that the uncertainty is half the smallest division. So when we subtract our two readings to get the length of the pencil,tuwv8 fnc6796 6lez pz 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.