An iron metal rod is to maintain an accuracy of one part per million. The coefficient of linear expansion of iron is `1 xx 10^(-5 //@)C` respectively. The difference in lengths is `10cm` at all temperatures. Their initital lengths must be respectively.

Answer

C

Explanation

`(Deltal)/(l) = 1//10^(6) rArr (Deltal)/(l) = alphaDeltat`