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JAMB Physics 2009 Question 25

Question 25

Heat Transfer

A man standing 2 m from a charcoal fire is warmed mainly by

  1. A.convection.
  2. B.radiation.
  3. C.refraction.
  4. D.conduction.
Show the answer and explanation

Answer: B (radiation.)

Explanation

Hot air from the fire rises upwards (convection), and air conducts poorly, so the heat reaching a person standing beside the fire comes mainly by radiation.