Question

# If a barometer is kept on the earth's surface then calculate the height of the barometer column h. Atmospheric Pressure (Pa) is 105. The density of mercury (ρm) is 13600 kg m−3. Gravitational acceleration (g) near earth's surface is 10 m s−2.64 cm74 cm84 cm94 cm

Solution

## The correct option is B 74 cmGiven: Acceleration due to gravity, g=10 m s−2 Density of mercury, ρm=13600 kg m−3 Atmospheric Pressure, Pa=105 Pa The weight of the liquid in the column balances the atmospheric pressure in the barometer. ρmgh=Pa 13600×h×10=105 h=0.735 m≈74 cm

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