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The height of the mercury column in a ba...

The height of the mercury column in a barometer provided with a brass scale corrercted at `0^(0)C` is observed to be `74.9 cm` at `15^(0)C`. Find the true height of the column at `0^(0)C`.
`alpha_(b) = 20 xx 10^(-6 //0)C` and `gamma_(Hg) = 175 xx 10^(-6 //^(0)C)`

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