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Binita Fardeen Khanna
Asked: 2022-11-07T14:41:10+05:30 In:

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)`
A. `74.82cm`
B. `79.92cm`
C. `74.12cm`
D. `72.64 cm`

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)`
A. `74.82cm`
B. `79.92cm`
C. `74.12cm`
D. `72.64 cm`
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1 Answer

  1. Correct Answer – A
    `H_(0)rho_(0)g = H_(t)rho_(t)g , H_(0)rho_(0) = H(1 + alphat)(rho_(0))/((1 + gammat))`
    `:. H_(0) = H[1 – (gamma – alpha)t]`

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