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JAMB Physics 2005 Question 41

Question 41

Change of State and Vapours

When the temperature difference between the wet and dry bulbs of a hygrometer is high, this indicates that

  1. A.it is about to rain.
  2. B.there is plenty of sunshine.
  3. C.the relative humidity is low.
  4. D.the relative humidity is high.
Show the answer and explanation

Answer: C (the relative humidity is low.)

Explanation

Water evaporates fast from the wet bulb in dry air, cooling it a lot; a big difference means low relative humidity.