A simple barometer is constructed using a liquid \(Q_{1}\...
A simple barometer is constructed using a liquid Q1 of density 16.2g/cm3. Calculate the least lenth of the tube to be used to measure pressure of 1.5atm. [Density of mercury = 13.6g/cm3, 1atm = 76.0 cm of Mercury]
1358mm
957mm
760mm
638mm
Correct answer is D
Let hQ and ρQ be the least length and the density of Q1
while h and ρ are the length and density of mercury respectively.
h×ρ×g=hQ×ρQ×g
76cm×13.6×10=hQ×16.2×10
hQ=76×13.6×1016.2×10
hQ=10336162
hQ≊
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