An aluminium measuring rod, which is correct at `5^@C` measures the length of a line as 80 cm at `45^@C` If thermal coefficient of linear expansion of aluminium is `2.50xx10^(-4)//^@C`, the correct length of the line is:

Explanation

`L_(2) = L_(1) + L_(l)alphaDeltat`
`L_(2) = 80 + (2.50 xx 10^(-5))(80)(40) = 80.08cm`