Assuming that the atmosphere has the same density anywhere as at sea level (ρ=1.3kg/m3) and g to be constant (g=10m/s2), what should be the approximate height of the atmosphere so that the atmospheric pressure at sea level is p0=1.01×105N/m2 ?
A
6km
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B
8km
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C
12km
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D
18km
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Solution
The correct option is B8km Let h be the height of the atmosphere and assume pressure at height h to be zero Then, pressure at sea level P=ρgh i.e 1atmosphere=1.01×105N/m2=ρgh Given, ρ=1.3kg/m3,g=10m/s2