A liquid of density 1.70 g/ml is filled in the barometer, in place of mercury. What should be the length of liquid column, if another barometer filled with mercury, is measuring 75 cm pressure?

Question

Prashant Kotian · Accepted Answer

Correct answer: C. The hydrostatic pressure is P = d * g * h. Equating the pressure of the liquid column to the mercury column: d_liq * h_liq = d_Hg * h_Hg => 1.70 * h_liq = 13.6 * 75 => h_liq = (13.6 * 75) / 1.70 = 600 cm (Option b). However, the printed answer key in the book lists (c) as correct, which corresponds to the incorrect formula h_liq = h_Hg * (d_liq / d_Hg) = 75 * 1.70 / 13.6 = 9.375 cm.

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