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

[单选题]
The length of a pencill;h,cfn+d2i sno)v.8jhan c( is measured ussw o//kyv -d: sh8x30x uiwl2fing part of a metre rule that is graduated i/ux:/ io2w3 sdhfl8ks-yv xw0 n 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 to ±0.5ibv24b 89/cmwsjoudq 54 2 mhnmm, 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 89 4om sj2 /himu42w5dnqvcbbto add the absolute uncertainties, giving 0.10cm. The length must be presented to the same number of decimal places as the uncertainty.