The height at which the atmosphere ceases to exist is about 80km. If the atmospheric...

JAMB 2001

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

A. 380mmHg
B. 570mmHg
C. 190mmHg
D. 480mmHg

WAEC offline past questions - with all answers and explanations in one app - Download for free

Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts

WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709

Correct Answer: Option B

Explanation

(p - 760)/(0 - 760) = (h - 0)/(80 - 0)
∴ (p - 760)/-760 = (20 - 0)/80
80(p-760) = -760(20-0)
∴80p - 60800 = -15200
80p = 60800 - 15200
80p = 45600
∴ p = 45600/80
p = 570mmHg

Previous Next

Go back to Phy classroom

Report an Error Ask A Question Download App