Question

the length of a rod is (11.05± 0.2) cm. what is the length of two rods?

Answer 1

(11.05± 0.2)+(11.05±0.2)
22.1±0.4
Error will be added

Answer 2

$2l=(22.10 \pm 0.40)\ cm$

Explanation:

Given that, the length of a rod is (11.05± 0.2) cm. We need to find the length of two rods. It can be calculated as :

$2l=2(11.05\pm 0.2)\ cm$

It is a case of uncertainty. The first value is actual value and the other value is uncertainty. It is calculated as :

$2l=(22.10 \pm 0.40)\ cm$

So, the length of two rods is $(22.10 \pm 0.40)\ cm$. Therefore, it is the required solution.

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