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A liquid of density 800 kgm^-3 is used instead of mercury in the Torricelli barometer:
The height of the liquid column is (Density of mercury =13.6 ×10³ kgm^-3 and atmospheric pressure =76 cm of Hg)

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800 m

13.2 m

12.9 m

13.6 m

answer is B.

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Detailed Solution

$Pressure due to 76 cm of mercury is equal to pressure due to h height of liquid column$

$13.6 \times 10^{3} \times 0.76 = h \times 800 h = 12.92 m$

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