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/cm3 ρ = 0.00013g/cm3 )
A. 380mmHg
B. 570mmHg
C. 190mmHg
D. 480mmHg
Correct Answer: Option B
Explanation
ρmhm = ρaha
13.68(760 – p) × 10‾³ = 13 × 10^–5(20 × 10³)
760 – p = (13 × 10−5 × 20 × 10³)/(13.68 × 10‾³) = 19.00 × 10¹
760 – p = 190
p = 760 – 190 = 570mmHg
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