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

[单选题]
The length of a pencil is measured using part of am*cw1kxspi sx :: 0b)2vl(hz t hs5vy( metre rule that isz 9c.hnb7 ;79ow atb5l1n.iyqxms( ez graduated in mil bamsl71i;w9z q9nh. on 7byct (.5zxelimetres, 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 scap*v4 ht epg (k(;cfo0gle we can take each reading to ±0.5mm, 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 to add the absolute uncertainties, giving 0.10tv cfgg*p(p; keoh4 (0cm. The length must be presented to the same number of decimal places as the uncertainty.