The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is
(ρm = 13.6g/cm\(^3\) ρ = 0.00013g/cm\(^3\) )
380mmHg
570mmHg
190mmHg
480mmHg
Correct answer is B
ρ\(_m\)h\(_m\) = ρ\(_a\)h\(_a\)
13.6(760 - p) × 10\(^{-3}\) = 13 × 10\(^{-5}\)(20 × 10\(^3\))