Brass scale of a Barometer gives correct reading at `0^(@)C`. Coefficient of linear expansion of brass is `18 xx 10^(-6 xx @)C`.

Brass scale of a Barometer gives correct reading at `0^(@)C`. Coefficient of linear expansion of brass is `18 xx 10^(-6 xx @)C`. If the barometer reads `76cm` at `20^(@)C`, the correct reading is
`(gamma_(Hg) = 18 xx 10^(-5 //@)C)`
A. `76.426 cm`
B. `75.7 cm`
C. `76.642 cm`
D. `76.264 cm`

Brass scale of a Barometer gives correct reading at `0^(@)C`. Coefficient of linear expansion of brass is `18 xx 10^(-6 xx @)C`. If the barometer read

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