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QPages 96-97: Q10: HC Verma: Concepts of Physics - Volume 2 Heat Transfer Pages 96-97: Q10 Solution: Cloudy nights are warmer than the nights with clean sky. Explain.
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often think clouds cool the Earth by reflecting sunlight, but at night the warming effect comes from clouds absorbing and re‑radiating infrared, reducing net upward flux. Remember that clouds are at a similar temperature to the surface, so they emit comparable IR but block escape to space.
Cloudy nights are warmer than the nights with clean sky. Explain.
Step-by-Step Verified Solution
**Answer:** Cloudy nights are warmer because clouds reduce radiative heat loss from the earth.
**Step-by-Step Explanation:**
On clear nights, the earth radiates heat into space and cools rapidly. Clouds absorb and re-radiate some of this heat back to the earth, reducing net heat loss and keeping the surface warmer [citation:13].
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