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

Physics
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
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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

There is an explanation video available below.

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Explanation Video

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JAMB CBT Mobile App 2025 - Free Download
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076
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