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

[单选题]
The length of a pencil is measured using part of ib8,s9hnh g5u8j/a wol1j+vpa9cd cgg495n uk2mbyz . metre rule that is graduated in millimetres,59z4 2bmu.k yd ccn9gg 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 ±0.5q m4kpzu6vt6 +8)2kxwerb*h fmm, following the rule that the uncertainty is half the smallest division. So when we subtr +m8z6 pbrkf) qt*xk46h2wvu eact 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.