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JAMB Physics 2011 Question 22

Question 22

Heat Transfer

The ground is always cold at night because the

  1. A.sun no longer shines at night
  2. B.atmosphere reflects the sun's energy at night
  3. C.atmosphere absorbs the sun's energy at night
  4. D.earth radiates heat to the atmosphere at night.
Show the answer and explanation

Answer: D (earth radiates heat to the atmosphere at night.)

Explanation

At night the ground keeps losing heat by radiation but receives none from the sun, so it cools down.