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JAMB Physics 2001 Question 2

Question 2

Pressure

The height at which the atmosphere ceases to exist is about 80 km. If the atmospheric pressure on the ground level is 760 mmHg, the pressure at a height of 20 km above the ground level is

  1. A.380 mmHg
  2. B.570 mmHg
  3. C.190 mmHg
  4. D.480 mmHg
Show the answer and explanation

Answer: B (570 mmHg)

Explanation

Taking the pressure to fall evenly from 760 mmHg at 0 km to 0 at 80 km, 20 km is a quarter of the way up, so the pressure is 760 × ¾ = 570 mmHg.